Regarding the Power Trac, the more I think about it, you could put a 2-spool valve with a joystick in it to control speed AND direction with one stick, like a fighter pilot. It might be a bit jerk to turn VS a steering valve, but it could easily be done.
For that matter, you could put switches on the joystick and control the
FEL and quick attach with solenoid valves from the same stick. Complete one hand operation.