How can I disable the ISO14755 shift-ctrl hotkey?

[Gregor Zattler]

Hi rxvt-unicode -users,
* 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? 


Ciao, Gregor
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