On my last rebuild I installed a Banggood clone of the FuriousFPV Innova OSD-VTX with the MWOSD/VTX branch of the firmware. Really nice to be able to change channels and VTX power using stick commands!
MWOSD GUI seems to work via the ComBridge -- last time I tried I couldn't get Arduino to flash the firmware. To wire things up I followed the Revolution only section of LibrePilot MWOSD Setup. Does dRonin's ComBridge support DTR on pin 9 of the FlexiIO port on the Revolution?
I don't think so. Might be worth raising an issue on Github for that.
We don't, but from what I recall there is a small window after power is applied to flash before the OSD starts.