Solid attitude control

I tried to develop a kinetic warhead for the SM-3 missile. However, the kinetic warhead uses solid fuel for attitude control. But in this game, there is no solid fuel that can be controlled on/off. So, I would like you to make a solid fuel that can be turned on and off.
Here is a video of the kinetic warhead.
Also, I would like it to be able to switch on and off even when it is on!