[Lenny5160]

I don't think I fully grasp the question about the stop and shifter using the same timer, but you can absolutely just shift on RPM if you want to. I shift my SST and SC cars on RPM.

If someone told you that you can't, it is possible that they were saying "you can't shift by RPM while on the stop" because being "on the stop" implies that the throttle stop is activated, and your RPM generally stays flat while that is the case.