When working with compact pressure machinery i sometimes need to make moving particles not flee. But well, that is pretty hard to do that: TTAN conducts electricity, CRMC and QRTZ break at negative pressures... SPNG is almost fine. "Almost" - since it burns. So i have an element suggestion - FILR, an element which works pretty much same TTAN with life -1 does, though it does not block pressure. An Another solution could be just making particles with life = -1 saveable, so we can use them in saves/stamps.
EDIT: Forgot to mention that FILR is Filler, though this is obvious.
EDIT 2: Actually both making an element and making life = -1 save could be useful, so i can make TTAN with tmp = 1 non-sparkable.