RE: i want front brakes...ideas?
You could try to mount some kind of "drum brake" style system. I'm picturing something where a servo on each front wheel/suspension arm somewhere, move a small "shoe" that presses against the inside of the front wheel with some amount of force, slowing the Rustler down quit fast. If you use the 2 position 3rd channel, you'd have basically what would be like ON and OFF... so you reach 50 mph and you want to slow down in a hurry? Flip the switch and your Rustler, depending on the brake strength, will slow right down...flip the switch back and release the brakes.
There are more ways but considering the lack of space and design to accommodate a proper front wheel braking system, you will have to rely on some custom work there.