TL;DR: I'd like to be able to walk through harvested mineral crystals, especially after someone has dropped them.

The other day I was in a danger room, one of the ones with a narrow walkway going around elemental traps in the corners. It was a moderately difficult room, but we were doing okay, until one of the guys died and left the party, dropping his crystal right in the corner. Suddenly we couldn't go around the outside of the elemental traps any more, and let's just say that the room got a Whole Lot Harder. I couldn't move the crystal, since I had one of my own, and when I picked up the other one, it dropped mine right in the same place.

It's not the end of the world, I know, but it seems like it would be a fairly small change to make it possible to walk through those crystals, and it would help prevent this kind of situation, where someone leaving can royally screw up a party.