You can permamently switch this feature off by disabling the readline +extension:

+   URxvt.perl-ext-common: default,-readline

--- a/doc/rxvt.7.man.in
+++ b/doc/rxvt.7.man.in
@@ -201,6 +201,24 @@ other combination either by setting the \fBsearchable-scrollback\fR resource:
 .Vb 1
 \&   URxvt.searchable-scrollback: CM-s
 .Ve
+.IP "The cursor moves when selecting text in the current input line, how do I switch this off?" 4
+.IX Item "The cursor moves when selecting text in the current input line, how do I switch this off?"
+.PD 0
+.IP "During rlogin/ssh/telnet/etc. sessions, clicking near the cursor outputs strange escape sequences, how do I fix this?" 4
+.IX Item "During rlogin/ssh/telnet/etc. sessions, clicking near the cursor outputs strange escape sequences, how do I fix this?"
+.PD
+These are caused by the \f(CW\*(C`readline\*(C'\fR perl extension. Under normal
+circumstances, it will move your cursor around when you click into the
+line that contains it. It tries hard not to do this at the wrong moment,
+but when running a program that doesn't parse cursor movements or in some
+cases during rlogin sessions, it fails to detect this properly.
+.Sp
+You can permamently switch this feature off by disabling the \f(CW\*(C`readline\*(C'\fR
+extension:
+.Sp
+.Vb 1
+\&   URxvt.perl-ext-common: default,-readline
+.Ve
 .IP "Why doesn't rxvt-unicode read my resources?" 4
 .IX Item "Why doesn't rxvt-unicode read my resources?"
 Well, why, indeed? It does, in a way very similar to other X
diff --git a/doc/rxvt.7.pod b/doc/rxvt.7.pod

--- a/doc/rxvt.7.pod
+++ b/doc/rxvt.7.pod
@@ -65,6 +65,23 @@ other combination either by setting the B resource:

    URxvt.searchable-scrollback: CM-s

+=item The cursor moves when selecting text in the current input line, how
+do I switch this off?
+
+=item During rlogin/ssh/telnet/etc. sessions, clicking near the cursor
+outputs strange escape sequences, how do I fix this?
+
+These are caused by the C perl extension. Under normal
+circumstances, it will move your cursor around when you click into the
+line that contains it. It tries hard not to do this at the wrong moment,
+but when running a program that doesn't parse cursor movements or in some
+cases during rlogin sessions, it fails to detect this properly.
+
+You can permamently switch this feature off by disabling the C
+extension:
+
+   URxvt.perl-ext-common: default,-readline
+
 =item Why doesn't rxvt-unicode read my resources?

 Well, why, indeed? It does, in a way very similar to other X
diff --git a/doc/rxvt.7.txt b/doc/rxvt.7.txt

--- a/doc/rxvt.7.txt
+++ b/doc/rxvt.7.txt
@@ -60,6 +60,22 @@ FREQUENTLY ASKED QUESTIONS

            URxvt.searchable-scrollback: CM-s

+    The cursor moves when selecting text in the current input line, how do I
+    switch this off?
+    During rlogin/ssh/telnet/etc. sessions, clicking near the cursor outputs
+    strange escape sequences, how do I fix this?
+        These are caused by the "readline" perl extension. Under normal
+        circumstances, it will move your cursor around when you click into
+        the line that contains it. It tries hard not to do this at the wrong
+        moment, but when running a program that doesn't parse cursor
+        movements or in some cases during rlogin sessions, it fails to
+        detect this properly.
+
+        You can permamently switch this feature off by disabling the
+        "readline" extension:
+
+           URxvt.perl-ext-common: default,-readline
+
     Why doesn't rxvt-unicode read my resources?
         Well, why, indeed? It does, in a way very similar to other X
         applications. Most importantly, this means that if you or your OS
diff --git a/src/Makefile.in b/src/Makefile.in

--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -542,3 +542,102 @@ xdefaults.lo: keyboard.h
 xpm.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h rxvtutil.h
 xpm.lo: rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h salloc.h
 xpm.lo: libptytty.h rxvtperl.h hookinc.h rsinc.h
+
+command.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+command.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+command.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h version.h
+command.lo: command.h keyboard.h
+encoding.lo: ../config.h encoding.h table/iso8859_1.h table/iso8859_15.h
+encoding.lo: table/iso8859_2.h table/iso8859_3.h table/iso8859_4.h
+encoding.lo: table/iso8859_5.h table/iso8859_6.h table/iso8859_7.h
+encoding.lo: table/iso8859_8.h table/iso8859_9.h table/iso8859_10.h
+encoding.lo: table/iso8859_11.h table/iso8859_13.h table/iso8859_14.h
+encoding.lo: table/iso8859_16.h table/koi8_r.h table/koi8_u.h
+encoding.lo: table/ksc5601_1987_0.h table/big5.h table/gbk_0.h
+encoding.lo: table/gb2312_1980_0.h table/cns11643_1992_1.h
+encoding.lo: table/cns11643_1992_2.h table/cns11643_1992_3.h
+encoding.lo: table/cns11643_1992_4.h table/cns11643_1992_5.h
+encoding.lo: table/cns11643_1992_6.h table/cns11643_1992_7.h
+encoding.lo: table/cns11643_1992_f.h table/big5_ext.h table/big5_plus.h
+encoding.lo: table/viscii.h table/jis0201_1976_0.h table/jis0208_1990_0.h
+encoding.lo: table/jis0212_1990_0.h table/jis0213_1.h table/jis0213_2.h
+encoding.lo: table/compose.h table/category.h
+fdpass.lo: ../config.h libptytty.h
+init.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+init.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+init.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h init.h
+iom.lo: iom.h iom_conf.h rxvtutil.h callback.h
+keyboard.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+keyboard.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+keyboard.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h keyboard.h
+keyboard.lo: command.h
+logging.lo: ../config.h ptytty.h libptytty.h ptytty_conf.h rxvt.h rxvtlib.h
+logging.lo: optinc.h feature.h encoding.h rxvtutil.h rxvtfont.h rxvttoolkit.h
+logging.lo: iom.h iom_conf.h callback.h salloc.h rxvtperl.h hookinc.h rsinc.h
+main.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+main.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+main.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h keyboard.h
+misc.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+misc.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+misc.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h
+netdisp.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+netdisp.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+netdisp.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h
+proxy.lo: ../config.h ptytty.h libptytty.h ptytty_conf.h rxvt.h rxvtlib.h
+proxy.lo: optinc.h feature.h encoding.h rxvtutil.h rxvtfont.h rxvttoolkit.h
+proxy.lo: iom.h iom_conf.h callback.h salloc.h rxvtperl.h hookinc.h rsinc.h
+ptytty.lo: ../config.h ptytty.h libptytty.h ptytty_conf.h rxvt.h rxvtlib.h
+ptytty.lo: optinc.h feature.h encoding.h rxvtutil.h rxvtfont.h rxvttoolkit.h
+ptytty.lo: iom.h iom_conf.h callback.h salloc.h rxvtperl.h hookinc.h rsinc.h
+rxvt.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+rxvt.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+rxvt.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h
+rxvtc.lo: ../config.h rxvtdaemon.h rxvtutil.h libptytty.h rxvt.h rxvtlib.h
+rxvtc.lo: optinc.h feature.h encoding.h rxvtfont.h rxvttoolkit.h iom.h
+rxvtc.lo: iom_conf.h callback.h salloc.h rxvtperl.h hookinc.h rsinc.h
+rxvtd.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+rxvtd.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+rxvtd.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h rxvtdaemon.h
+rxvtdaemon.lo: rxvtdaemon.h rxvtutil.h
+rxvtfont.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+rxvtfont.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+rxvtfont.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h
+rxvtfont.lo: table/linedraw.h
+rxvtperl.lo: ../config.h iom.h iom_conf.h rxvtutil.h callback.h rxvt.h
+rxvtperl.lo: rxvtlib.h optinc.h feature.h encoding.h rxvtfont.h rxvttoolkit.h
+rxvtperl.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h keyboard.h
+rxvtperl.lo: perlxsi.c
+rxvttoolkit.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+rxvttoolkit.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h
+rxvttoolkit.lo: callback.h salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h
+rxvtutil.lo: rxvtutil.h
+salloc.lo: salloc.h
+screen.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+screen.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+screen.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h salloc.C
+scrollbar-next.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+scrollbar-next.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h
+scrollbar-next.lo: callback.h salloc.h libptytty.h rxvtperl.h hookinc.h
+scrollbar-next.lo: rsinc.h
+scrollbar-plain.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h
+scrollbar-plain.lo: encoding.h rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h
+scrollbar-plain.lo: iom_conf.h callback.h salloc.h libptytty.h rxvtperl.h
+scrollbar-plain.lo: hookinc.h rsinc.h
+scrollbar-rxvt.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+scrollbar-rxvt.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h
+scrollbar-rxvt.lo: callback.h salloc.h libptytty.h rxvtperl.h hookinc.h
+scrollbar-rxvt.lo: rsinc.h
+scrollbar-xterm.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h
+scrollbar-xterm.lo: encoding.h rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h
+scrollbar-xterm.lo: iom_conf.h callback.h salloc.h libptytty.h rxvtperl.h
+scrollbar-xterm.lo: hookinc.h rsinc.h
+scrollbar.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+scrollbar.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+scrollbar.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h
+xdefaults.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h
+xdefaults.lo: rxvtutil.h rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h
+xdefaults.lo: salloc.h libptytty.h rxvtperl.h hookinc.h rsinc.h version.h
+xdefaults.lo: keyboard.h
+xpm.lo: ../config.h rxvt.h rxvtlib.h optinc.h feature.h encoding.h rxvtutil.h
+xpm.lo: rxvtfont.h rxvttoolkit.h iom.h iom_conf.h callback.h salloc.h
+xpm.lo: libptytty.h rxvtperl.h hookinc.h rsinc.h

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