Also does that mean you want it locked, or you still think we should let higher velocity save? @jacksonmj already explained pretty well why we aren't going to do this. It would make saves unnecessarily larger, and use up one of the last few bits in the field descriptor (some save format thing). Also air pressure and velocity aren't saved, so for all elements except energy particles it probably wouldn't make a difference.

Try making your particles speed up after the save loads then.