Keyboard passthrough for specific keys

[Adam Porter]

I use F12 to open my Yakuake console in Linux, but when my VM has focus, that key gets sent to Windows, which does nothing. I would like to be able to set certain keys to be ignored by the guest OS.

Note: I know about the ability to press the Host key and then whatever key you want and have it pass through, but this is not particularly useful--especially in seamless mode when you may not be aware of whether the guest or host have focus. It'd be much more useful to be able to set specific keys to always go to the host.