Hi, the ability to set the a specific motor RPM with the throttle stick could be beneficial as it would enable the same motor speed to be reached for the same stick position regardless of the battery voltage and model attitude and airspeed. Hacker were playing with this (a complete new type of controller):

http://www.hacker-motor.com/en/news/54/index.html

but I don't know if anything came of it. The pilot would still need to adjust the throttle stick position to set the right motor RPM to obtain the desired air/ground speed. The pilot would still have to continuopusly adjust the throttle setting to achieve constant speed, but it may make achieving constant speed a bit easier, and would make different batteries essentially have the same throttle feel. In this case the feedback is from the motor RPM back to the speed controller, much the same way a servo works. There was some discussion of this on RCU previously.

Regards
Clint