Allowing only one active reactor doesn't pass the realism/logic test for me; it feels like a rules gimmick. Outside of something like a hybrid car, I can't think of any instance of a vehicle with multiple engines only using one at a time, or at least having the option to do so.really like how this is looking, for the most part, my only issue is not being able to have multiple reactors on at the same time, this seems counter productive and i cant see as to why you would not allow multiple reactors.