I personally think the srbs of the game need a well needed overhaul which changes everything about them. My idea is that we split up the srbs into sections: Choose a fuel source (least efficient at bottom of tech tree, most efficient at top) (not too necessary, but what would differentiate earlier and later booster in the tech tree?) Choose an igniter (not necessary) Choose a nozzle (launch, space, gimbal variants, also tilting the nozzle by itself, not entire booster) Most o