I had the same problem, so I am trying to "trick" the software. I tried making the motor functions part of a user block and modifing them there, like
SetMotor(1,(leftjoystickvalue*(465/500))
or something like that, I'm too lazy to get the real code

, but it didn't work

. Maybe I'll try the goto C command. I heard someone say that the VEX kit checks to see if one modifies the variables in the same loop as an RX block. The goto command could probably trick it. Does it work in EasyC?
Update: the goto command works, but it didn't trick the vex kit.