How can I disable the ISO14755 shift-ctrl hotkey?

[Gregor Zattler]

Hi rxvt-unicode users,
* Gregor Zattler <telegraph at gmx.net> [25. Aug. 2007]:
> * Yin Wang <shredderyin at gmail.com> [22. Apr. 2006]:
>> I'm using Emacs inside rxvt-unicode. Often I use something like a
>> Control+Shift combination. For example C-@ (set-mark-command) is
>> actually Control+Shift+2 on my keyboard. Because urxvt captured
>> Control+Shift, this key stops to function in my Emacs. If I press this
>> key, the small window "ISO 14755 mode" appears, which is very
>> annoying. I can't disable this window even using --disable-iso14755 in
>> configure.
> [...]
>> Is there a way to turn this feature off completely?
> 
> Last year Ilya Voyager Schurov sugggested to hack the source
> code.  Isn't there any other way of disabeling the whole feature?  
> I start urxvt with ++iso14755_52 but this only stops the "Keycap
> picture insert mode" window but not the "ISO 14755 mode" window.
> Any ideas other than hacking the code -- which I'm not able to
> do? 

Any idea on this problem?  I now use emacs org mode which heavily
relies on ctrl-shift key combos.

Ciao, Gregor