Im not sure if i understand your question.
In space exploration there are special turbines, which generate less MW, but return part of used up steam back as water. This is only useful on planets without water, so that you dont have to deliver a lot of new water, but rather reuse it, at cost of reduced efficiency. Basically 100 steam goes in, 99 water & 75% MW goes out, which can later be again converted into 99 steam.
I guess in this mod this could be done in steam converter as a new recipe that returns water (this way you could do it without adding new entities) but generates less torque?