I think it would be great to include a key listen feature with a hi cut and low cut filter on the gate. Plus, there is plenty of room on the existing gate touch screen page to add these buttons..Pushing Key listen could route that channel to PAFL while adjusting the filters.
I had to mix a Cajón last week using a Qu16 and it was really very difficult to get a consistent and clean snare sound from the front mic without the key listen feature on the gate.