Allow typing backtick with CTRL

If you're like me you loved using the backtick button for the good old Quake terminal. I'd love to have the same in Guake, but setting that prevents me from typing an actual backtick if I need to. What I am proposing is that an option be included in Guake to change how the backtick is typed so that CTRL+Backtick will actually print the backtick character. This way we can have our cake and eat it too.

I use the terminal much more often than I use the backtick, so it would be far preferable to use the CTRL modifier for the backtick rather than using it to open Guake.