Sure...not a problem. I'd be happy to add it.
-app103
Ctrl-Shift-F9 looks a bit cumbersome for easy start/stop, specially when you're measuring software time, IE, you click on a button, and then by the time you do Ctrl-Shift-F9... you lose one valuable half-second. A single key hotkey would be MUCH better.
Maybe you can add a button "select hotkey" and then make the user press whatever key he wants to assign as hotkey?
For instance, for my needs pressing "`" (next to 1 and above Tab on US-En layout) would be the best hotkey...
Just my $0.02...