I'll preface my answer by stating I know basically NOTHING about 4DTV receivers, I owned one for a couple months but bought it to resell, and didn't play with it much, just verified it worked and had good ID.
That being said, I think you can have 2 levels of functionality on your 922, full or partial. Full would require a good Unit ID/good battery (and would allow reception of 4DTV programming) but I think you can still use that receiver for a dish mover/polarity-servo switcher just by hooking it up like an old analog receiver. But you may need a remote to be able to perform even the "partial" functions, not sure.
I know with my old Toshiba 1820 (which is what I use to move my BUD and polarotor), I can move the dish and switch polarity with buttons on the front of the receiver, but need a remote to do any advanced programming. If you have front panel controls you could hook up your corotor on some short leads and go from an even to an odd (H to V) channel and see if it turned the servo.....same deal if you have an actuator, short leads and select different satellites and see if it operates the motor.
Btw, 4DTV is going through a big transition right now, so you might want to do some reading in the 4DTV forum here if you want to subscribe to that service in the future. And any 922-specific questions might get more attention (and knowledge) over there also.