I have the DX3R Pro and I can adjust the servo speed via the scroll down menu in the TX. Does the DX4R DSMR radio have the same feature? I've looked at all the literature the new DSMR radio and it's all about how great the AVC is, which BTW as I read the ROAR rule book is illegal at ROAR races. Also will the DX4R DMSR radio work without AVC, on the older Spectrum receivers that are compatible with my DX3R Pro?