Make F5 exit Presentation Mode
Currently, F5 enters Presentation Mode.
However, F5 was not allowed because laser pointer buttons send an F5 keycode (see https://bugzilla.gnome.org/show_bug.cgi?id=556162). I'm not very familiar with these devices, but maybe that's because you can accidentally press the button on the laser.
Maybe it's possible to make F5 exit presentation mode only if the signal is coming from a keyboard? Because that would be consistent with entering/exiting fullscreen mode.