I see some merit in this idea. It would be an easy way to adjust how much is coming out of the nozzle as it is doing different things like outside parameters or inside parameters for screw holes. And I don't see this as mutually exclusive to having a sensor that automatically sensed and adjusted the filament diameter. Even with that, I may decide for a given print I want a little more filament to force things to fuse harder????

Any way, it would not be that much code to do this. It would be pretty straight forward. But I can't help because I don't have an LCD panel. With out the actual hardware to play with, it would be hard to get the firmware working right!