Remember when people wanted metal planets where you could build anywhere? (I added this to devastated since I had it handy) It seems you can add metal spots as regular terrain features, and they are fully functional. They even appear on top of unit canons, although those don't seem to be buildable.
You might as well just remove the build limitation of mex xD Though what does adding as terrain feature mean. Any loophole to control positioning?
That was the next step. The position argument used with brushes doesn't seem to work. However with the ring noise type I do have a test case with two perfectly balanced metal clusters
Well, that was an artifact of a very small planet, and the spawns were off. I can get two balanced with pole distance, but you'd probably need spawn-anywhere and assigned poles to make it work.
So close, but: a) those craters are kinda in the way. That may be fixable with some 3d/texturing skills b) soooooo maaaaany mex too nuke, the texturing system fails during camera movement and shows some black lines c) spawn mex screw it up is there a way to make features appear in a somewhat sparse but ordered grid?
You could have a program put out rows of pole-distance ranges. I don't know if anything could be done about longitude though.