Dungeoneering is by far the best skill we have in game, its currently the only skill we have that actually takes some skill (not a simple click and wait mechanic the rest have). The trouble is with dung is it heavily relies upon combat.
I would like to see something that takes the core principle of dungeoneering of needing actual skill but does not rely upon combat!
Look at shifting tombs for example, a great piece of content but quite repetitive but the core principle of it could make for a great skill.