having puzzles in dungeons would be cool, like some that could require a number of people to be able to get to hidden areas of a dungeon, that would promote more grouping. even if its something like having 3 guys step on some switches while you run inside a door. or maybe even have it so certain classes have skills that can be used in puzzles.

i also like the idea of being able to use your weapons or magic on other things in the world, like if your a mage you could melt an ice block in your way or if you have a sword you can cut down some viles to clear a path