Release Candidate Firmware V1.25 RC5

[XORadmin]

I'm not sure I understand, what you are after. In particular I don't understand what you mean by "GATE ON" as opposed to the current implementation.

Do you mean an "Auto Fill-In Gate" on/off as an editor convenience setting? [would be more complex than the Trigger Fill-In because you only know the gate length after you've entered the next note, but certainly doable]

Or is it something else?

I think a filled in trigger with FE is meant as 'Gate On'.

That is nothing I will do. You set your prefered workflow only once and then leave it like this. It is not that it is being changed continuously.
Also as for the 'ghost' gates that are described. Even though the Autogate is something trackers always had. This is also common for all kind of sequencers (maybe excluding typical modular ones). Note On until the Note is Off again. This applies for a piano roll and many more and also clasically for trackers.
So this option will stay and additionally you can set up to not use it and go for automatic triggers or totally manually fill in gates/triggers.