I think it would be good if there was one wall with options, instead many. So when you choose it there will be sub menu with checkboxes, and you can choose what attributes it will have. It would be simpler, and save a lot of space for future implementations.
P.S. Special states of wall i.e. e-hole, conductive, etc.
That's a good idea. But for now, maybe he can just make more varients of walls. Then, once he's done that we can customise them. Currently, we almost have all types of walls.
Indeed, this is another way to do things with walls, i.e. i want get uran without all that lava, plutonium and neutrons. With this customizable wall it will be simple enough, i just set in options that it will absorb, or block, all except uran.