Mining on planets mean you'll be getting alot of stone, currently stone is mostly useless. Meanwhile we're forced to build structures and bases out of steel on planets, which makes little sense when we have access to so much stone. What we need is a new set of structural blocks which are made (mainly) from stone/gravel. It could be concrete, bricks, whatever, it simply must be made using the stone. These blocks could be made useless on space somehow, working only on planets... Another suggestion is a terraforming block, i.e. a block akin to welder, but it places voxels gradually, so we can level terrain, pave roads, etc... If both of these features get added I would suggest separating stone from soil. So soil can be placed with terraforming block and stone would be used for concrete or whatever building block. I suppose Keen should have plans for the usage of planet voxels, but I hope it's something along these lines.