Adjust keyboard sensitivity in Logic Studio?

Yes, all the region parameters are available on the realtime MIDI notes you play. Deselect all regions, and adjust the dynamics parameter to reduce or expand the drynamics, and the velocity parameter to offset the velocities upwards or downwards.

If you need anything more than that, you can rig up all kinds of transformers in the environment for wildly complex stuff.

Yes, my post above is the best and correct way to do this in Logic.

Did you try it?

Dynamics is how dynamic you're playing is - 100% is the regular MIDI velocity. 50% is the dynamic range shrunk by 50% (ie, the difference between the softest key press and the loudest one is much less) - in other words, 50% less sensitive to touch. And correspondingly 200% expands the dynamics.

Then you can also use the velocity parameter to offset the strength of the playing. So if you wanted your entire key range to be in the 80-127 velocity area, you'd limit the dynamics to say 30%, and then bump up the velocity setting to move the velocities generated up to the range you want.