KAS sounds like a good idea. I would rather put despin rockets on the Star48B, but I'll consider it. IRL the spin-up motors are on the second stage. It wouldn't be realistic to put them on the Star48B. I've ran into a problem whilst testing the idea of a spun-up Star48B: how to spin-up the Star48B, while the second stage is still running. So the only easy way to get around that problem would be to put the spin-up rockets on the Star48B, which would be unrealistic. Unlike all of the SRBs in the game, I enabled engine shutdown so users could get semi-accurate results during burn times. For gameplay reasons, I'm not interested in a lot of that. But it sounds rather interesting to me. Thanks for the ideas.