In touring I leave alittle slack in the wires to make soldering/desoldering easier, and to allow the motor to move if I have to change the gearing.
In pro10 i leave alot of extra wire so it doesnt tweak the rear pod. The wires are loosely attached to the center shock.
Dont worry about the resistance for acouple of inches of wire, it wont make any difference at all. Short wires are nice to look at, and keep the car from getting all cluttered up.