The thing I'd most like is if they got better at understanding normal language requests. The art itself is great once you figure out how to tweak the prompts to exactly what you want, but I'd like to be able to give instructions in normal language.
Like that episode of TNG where Geordi was designing something in the holodeck and he could tell the computer to make it bigger, smaller, and adjust parts...
It's not the heat but the pressure that does it. The heat in a star is the byproduct of the pressure, it's not what causes the gold to form. And even then I think metals as heavy as gold only form in a supernova.