Ahh now I see what your'e saying. When you're pressing the screenshot hotkey, the prompt gets displayed. Ah yeah. I can't see a work around for that atm. You'll have to wait for a patch, I guess.
There is a variable in the hidden.ini file(bin\config\base\hidden.ini), that's called "LockControlScheme". I tried setting it to 1 though, and it apparently did nothing.