While I was/am building I find out that if you put INF in the variable maxSpeed the smoke trail just dissapears. So I guess it works with other missiles too. Knowing this you can now make guided bombs that track a target, that go forward, but that don't have a smoke trail behind them.
Inferno ✅
Guardian ✅
Interceptor ✅
Cleaver ❎
Simplest solution is
ignitionDelayset to0.01and set your physics tohighYou can maintain realistic performance without the smoke trail too
Same effect utilizied here
V1CTOR AERO GUIDED BOMB