I think I understand the idea now.
To get more specific, would the gate you have in mind affect the notes generated on the respective track where the gate is placed, right?
The thing is, a feature like that would have to be coupled to every note generated. In midi you always have to know the note number for which you adjust velocity or note off.
You also already mentioned ratcheting in the first post. It might be more feasible to express the gate idea that you have in mind by ratcheting a note multiple times.
Should be similar, no? The note is being turned on and off in quick succession.