Takin' it to the E-side....

[Serum]

A UBEC replaces the receiver battery. It transforms the higher voltage of the batteries into 5 or 6V.

If you want to use the mechanical brake, you need the Y cable. (the revo uses a Y cable allready, you can use that one) put both the controller and the brake servo on the same channel. (throttle) you need a servo that works into the right direction. Some work in opposite to others.

and yes, the MM controller is programmable to forward only.