Engines in Juno have a lot of gimbal and that's nice and all, but not all rockets gimbal their engines and I don't even know how you gimbal aerospikes. I'd like it to be possible to enable differential thrust in engine clusters.
For those who don't know, this is a technique where different engines will throttle differently to push the rocket unevenly. This is a cheaper way to do yaw and pitch without vectoring the engines.
It can be done, but it requires manually editing the input and using trigonometry to determine the strength of yaw/pitch inputs per engine. It can probably be done with some position detecting algorithm relative to the centre of mass, but I'm not sure this can be done without sticking a flight programme in every engine.