Hate to be the bearer of bad news, but this has been suggested before. I personally love the idea, and admire the amount of work you've put into this. I hope it gains traction, but it's been a while since mods have been friendly towards element suggestion saves. I'm glad you've posted on the forums, maybe add a link to the thread in the save. Best of luck, and I hope it gets added! +1
I am making an element suggestion
And we can have hot melt glue! And mix it with powder fillers, and....welp, heck I was just thinking about this yesterday.
+PortalPlayer lava can't be 200C so i am creating Molten Plastic part
The difficult thing about 'moving solids' that has prevented them being introduced, is the idea of multiple particles moving TOGETHER in a variable direction, while remaining solid. In other words, making a bouncy ball that remains coherent while bouncing, insted of scattering or trying to bounce off ITSELF.
Deformable plastic should actually be pretty easy to implement, I would think. They could just use the existing code governing GOO's behaviour, but just tweak it slightly so it doesn't disappear. In that sense, movable solids have been in the game for a long time.
Sure, if it's not 'gooey' then it's easy to do the rest
It would probaby just be LAVA(PLST) like most molten "elements".