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there are tricks to multiplex, so a 6 channel controller could control like 20 servos independently, but that would probably be too much detail for what you want to do . . .
i would need to have servomotors
can i connect the motor directly to the reciever?
1. like you said, have the servo turn and push a little switch that in turn switches on the motor. with enough switches you could drive your bot round on 2 channels. one channel for the left and and one for the right wheels, "tank steering" style.with each servo in the forward position it would push switches that would connect the motor to power in the "forward" direction.in the center position no switches would be closed so the motor stops.in the backward position again 2 switches would be pushed closed, this time with the opposite polarity to forwards direction.
I burnt a finger on it