In powder toy if you for example heat iron to 9000 degrees Celsius it only melts, no matter how hot it becomes. However, in reality, if you heated iron to that temperature...it would turn into clouds of vapourized iron! I think if this feature was added, powder toy would be way more like in real life.
There was a mod that allowed gas metal, it's old. I's worse than you think, it makes stuff harder to destroy and messes up stuff, just don't.
You could but would you really want VAPR floating off blocking explosions when you're nuking a city?