Missing UI: TRQ, RPM, Wheel Brake
Mission Options: Open Ramp (Huron), Lights, Collision Lights, Wheel Brake, Trim
Presumably, vehicle-unique options such as Open Ramp on other vehicles, as well as light options, will also not work when Remote Controlling a unit as Zeus.
Note that players who spawn into the game directly as units (non-Zeus slots) can open ramps and can see the RPM meter.