I am hoping that KM is the answer to my problem.
I need to enter a lot of times in Excel and prefer the numeric keypad. The problem is moving to "shift, colon" twice per entry if I am doing hh:mm:ss. I would like to programme/assign one of the F16 to F19 keys on a MAC Magic Keyboard which has a separate numeric pad. My coding skills are extremely BASIC (see what I did there?). that was a long time ago and to be honest I didn't pay enough attention!
Back in the day, the old Commodore/Amiga computer keyboards had parentheses buttons near the numeric pad which made entering formulae much easier and would like to add those to the F buttons too. I guess it would be the same principle.