Is there a HOLD...?
^^^^this,please^^^^^
Gain adjust from Wingman app would be cool too...
But I simply don't know how they would implement remote gain control without motorized knobs on the machine.
No need for motorized knobs; the knobs are only digital encoders which send signals to the software, which in turn tells the gain stages what to do. It's all internal. This is how the 788 can be remotely controlled by the CL-8 or CL-9, the 688 can be controlled by the CL-12, or how the Zoom F4/F8 can do remote gain from their mobile app.
If the knobs were actually analog pots as in the older SD unit (ex. 7-series excluding the 788) then they would need to be motorized.
The one place you tend to see motorized digital gain controls are faders on digital mixing consoles, such as when you trigger programmed scene cues and all of the faders move to their assigned positions. I believe this is done because the fader position provides a clear visual feedback for the engineer, but in terms of what's happening under the hood it's otherwise not necessary.