You could always try the wxsand style of semi-moving solids (via the item function for modding) Not proper moving solids, but whatever. OECake actually has a pretty effective system of moving solids, so you could look there for inspiration. Also, yes, I am watching this thread.
OECake actually has a pretty effective system of moving solids
I know that the current engine cannot do what OE-Cake's engine can do as it was programmed solely for air simulation, but since TPT++ is currently being made, would it be possible to add features of that engine to it?