I don't think there are that many functions that don't have mouse based equivalents.
I hardly ever use the pc keyboard other than to enter values.
A lot of shortcuts require both hands, or even just the right hand, which I find awkward.
Some functions involve holding down a key like Alt or Ctl while sweeping with the mouse.
This is the case with the scrub function in which you press J (for jog) while moving the mouse.
The ruler also has some zoom function that work this way.