Cave-In Rocks/Clean-Up Rewards: They should have some small reward to entice people to clean them up. They mostly just walk around them, since the effort to clean/break them up out-weighs the benefits. I think that as a slight counter-balance, they should give an amount of ore relative to level. Not too much that people spam mine alts and send them into the darkness (Don't they already have enough to fear?). Maybe 5 ore (Relative from nearest vein), increases by 3 every level, at a fix QL20. I.E. Lvl 1 rocks give 5 QL20 ore , lvl 2 rocks 8 QL20 ore, etc.
Better Supports: I know that sometimes having so many supports just gets in the way. Snake mining is even worse (Aesthetically, mind you). I think that even though you can make a "Small" support, you should be able to create "Grand" supports. Instead of Nuggets, make it take 2 Bars, and cover x2 the amount of "Small" supports (20 tiles, correct?). This would make the smaller supports more of a temporary thing until the "economy" get's up and running.
"Boosted" Items: In the outside ether of the "Real World" (I shudder at the very thought of it, as you should), better metal gives better "Boosts". In this case, Steel > Iron > Bronze. I very clear ranking system. In HnH, I believe that it is only based on QL(?). I think that this should be kept, but also be subject to the type of metal used. I.E. A QL30 Shovel would shovel/dig/whatever at the same rate as a QL10 IRON shovel, and so on. A don't mention Silver and Gold, because they are more of a trading thing, and very malleable (In Real Life(So scary

New Sorts of Decay: This is just an idea, and based slightly on "Real Life", so sue me! The idea is that using an Anvil deals a slight amount of decay to it (Maybe 1/4 the amount of natural decay) ever time it is used. Hitting a bar of metal on a slab of metal with a giant hammer wielded by a Pali-Basher (Just example), should have SOME sort of effect on the said anvil.
So, I've run all out of ideas for now. Let the comments.... BEGIN!
P.S. Constructive comments are welcome, whether in the form of "Terable idee, trolololol", or in the "This seems a good idea, but please consider...." formats. Thanks!
P.S.S. Some of these ideas might have been posted before. I did indeed use the search button, by my laziness would not let me look further then the entirety of page #2. Sue me.
Edit 1: Some grammar errors and some general editing