Great, I will try this procedure- only tedious part IMHO is that I have to do it in root screen to get the arrow keys and in play mode for the others......eh?
I tested 00106 and it does indeed toggle between stop and play. Not the power response expected for your UEI unit, but anything is something.

An incidental finding that I had on code 0782 is that the zero button will kick the DVD playback up to X2,X4,.....X32 speed and then back to normal playback with successive button presses on the zero key of my RCRP05B remote.

Already up to EFC 00069.... should be done in an hour!

Thanks for your help here, 3FG. Simple stuff, for some, but I definitely neeeded that leg up on this.