I've found out that synthesized RSST inherits the preceeding GEL's tmp value; useful to make RSST that becomes elements with a specific ctype, but GEL's maximum tmp is 100; set it higher and it's drop to 100 in one frame.  I tried making RSST(LAVA(VIBR)) by setting GEL's tmp to VIBR while the simulation was paused and touching it to GLOW before unpausing; it worked because the the GLOW and GEL reacted before the GEL's tmp dropped down and I had molten VIBR.  This doesn't work on mass scale so it's impossible to make a RSST-based production chain that makes molten VIBR or other kinds of LAVA whose ctype is an element with an ID higher than that of FRZZ.  I propose that RSST should inherit the tmp of adjacent CLNE or PCLN as well as ctype.

EDIT:  Nevermind; I just found out that they're already doing that with PBCN.