I think it would be interesting if we had an element that decays into PHOT, but as it decays, the decay rate speeds up, with each decay event producing more PHOT than before.
I think this could be used in some interesting reactors, bomb, etc.
I've always wanted GoL elements to have special properties. Some random ideas (GOL conducts electricty,HLIF triggers fire reactions, ASIM is always hot, 2x2 is always cold, MOVE suppresses nearby sparks, some may have to be room temp to be electronic safe) I'm sure you could think of some weird stuff, but it would make each type unique in sims other than just being GoL.
Also, I have kinda wanted to see DEUT compress under extreme pressure.