JVN,
Are those extension cables with the Vex orientation tab on them, or standard (FRC-type) PWM cables? I suspect the latter. You can probably make a few cents offering a connector package with bodies, contacts and some PWM cable.
Greater selection of motors is also high on my list.
I absolutely
LOVE that you're offering each starter kit item individually.
I'd like a short (1/2" or so) square shaft to 1/4" diameter shaft adapter, one I could just slip onto a shaft and use a standard coupler to hook up, say, a potentiometer.
Some of the sensor ideas discussed already might not be a great addition, since COTS stuff is trivially interfaced (except for the
keyed connector body...

. Maybe FVL needs to select a few to approve for competition...
Don