Excluding some keys from the keyboard grab

Hi,

The keyboard grab feature is very nice (I had been using an old version 
without it for who knows how long), but is it possible to exclude some 
keys or key combinations from the grab? Currently, if rdesktop is 
focused, no key combination to switch away from it (to another virtual 
desktop, for example) seems to work, so the user is pretty much trapped. 
Having to reach for the mouse just to get out of the grab is troublesome.

If this isn't implemented yet (I didn't find anything in the man pages, 
at least), it would be a nice thing to have. Naturally the keys to be 
ungrabbed should be freely configurable.

Thanks,
Matti

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