Many blocks in the future, should work as platforms. This is called solid top blocks.
Also, thing to add is block slopes. We hae to variants of doing them:
Only terraria-included ones.
Top option + top corners, left slope, right slope and top-half slope.
Second one is not so good, because you will have to many variants, to hammer through.
Adding a placeholder for something we don't know how is going to be implemented isn't going to be possible. It'll have to wait until a basic implementation is drafted up.
Many blocks in the future, should work as platforms. This is called solid top blocks. Also, thing to add is block slopes. We hae to variants of doing them:
Second one is not so good, because you will have to many variants, to hammer through.