I would imagine the breaking would be handled fine in the ESC as long as you would use the PWM out protocol on the Flight Controller. I should say, I am using the word stabilization very loosely. I know Traxxas and Spectrum have something in their receivers that does this but I am not sure exactly how.
As for the "stabilization," my assumption and very limited knowledge of how the firmware works was that you could set something similar like you would with a rudder, where if your tail end kicked out from lack of traction, similar to how your tail end on an airplane could kick out from the wind, the flight controller would compensate accordingly.
The transmission is actually probably the easiest I would imagine, but again, I am a complete firmware noob. That you could just set on a switch with a high and low, similar to how you would set up a buzzer or PWM relay. The servo right now is hooked up to a switch on my X-Lite that when the switch is low, it moves the servo horn to the far left, and when it is high it moves the horn to the far right.