Apologies if these have been mentioned before. It seems they're not listed in the manual, but I imagine most users would probably discover them sooner or later.
F10 - #1
F11 - #2
F12 - #3
+ 'shift' to use the 3 alternative assignations.
You can also get to them using F1-3 + ctrl and F1-3 + ctrl + shift, but that seems needlessly longwinded.
I find this very handy, partly because there are no RFX-specific keystrokes.