Can you edit velocity only of notes via a MIDI keyboard in Logic?
In the Event/Matrix/Score editor double click (not single click; this is important) the MIDI-In status button. Now when you select a specific note, you can affect the velocity and pitch by triggering your controller. So this does what you want basically, but it alters both pitch and velocity together.
So as long as you hit the correct note on your keyboard controller, you can edit the velocity via the sensitivity with which you strike your MIDI keyboard as you originally wanted to.
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