How hard would it be to either pull the GPS speed from the connected device or have a toggle to use gpsd to poll the current speed from it? (and maybe other interesting stuff like altitude and gridsquare)
Have it overlayed in a corner or something so it is always visible?
I don't want to be a pain and I am just thinking out loud a bit here, it would be a nice feature tho! Especially for those of us running different sized tires and our actual speedometer is now off. 😄