Re: slow starting
A friend of who really should have grown out of this stuff by his age tells me the latest generation of motors have speed control in them. And servo function. E.g the motors as included in the bargain (!) set 42100. All controllable via the Devils radio bluetooth. You can even use a game controller such as a PS4 dualshock talking to a fondleslab or phone relaying on to the motors. That requires a free 3rd party app that is simple enough even an adult can use it.
A friend, honest.