bump!
Does anyone care about this bug? This is indeed a showstopper. Especially since sometimes the keyboard shortcuts get randomly reverted to default. I can't report a bug about it because this happens once every few weeks in a classroom full of students and I can't get them to explain exactly what they were doing.
Another bit of information: AltGr is not normally aliased to Ctrl+Alt (e.g. I can't get task manager in WinXP by pressing AltGr+Del) it is only the case in C::B !
I have gone through all the shortcuts and this is the only one using Ctrl+Alt combination. Please change it!
Edit: Ctrl+Shift+G is available!! I'd guess that this was probably just a simple omission, all other shortcuts are Ctrl+Shift+something not Ctrl+Alt+something.