Vending stands have made coins valuable. Now a hearthling with a few handfuls of coins can walk down market row and have the option to buy a great number of things. Unfortunately, that handful of coins takes up precious inventory space. It has been suggested before (by Sabinati I believe, and possibly others), that a belt be implemented which adds a few slots for coins only (and maybe for keys too). I think it might reasonably be an item which takes a few high level materials. Perhaps a nugget for a buckle, and silk.
Likewise, now that coins are important, it should be possible nuggets to make into coins, and vice versa. A nugget would make 9 coins, and 10 coins would make a nugget. I hear smelted gold ore becomes nuggets, and it makes no sense that they should need to be made into bars before they can be made into coins.
I realize some of this is redundant, but it seems to me a very important issue.