I'd really like to see more melee weapons drop, and ones that are better as I go on.. As of right now, I've stuck with the same sword for a while, and all I keep getting are everything BUT swords.
I would love to see if the fire could go through solid things burning a hole, causing things to cave in, it could be like erase, but more fun. Maybe it could set soil on fire, and then be doused by water. I see fire as useless right now.