It’s funny you mention that, since Anduril has a mapping specifically for that purpose. From off, do a double click but hold the second click, and it’ll start at the ceiling then ramp down until you let go.
This works in both smooth ramping and discrete level UIs. They’re the same UI, really, except that one has a stair-step shaped ramp and the other is smooth… so there is no need to remember different actions for each.
I don’t think the D1S will ship with Anduril though. Maybe in the future sometime, but for now it’s still a work in progress.