Something that I’ve been wanting for a long time are player duels outside of the wolve’s den. It could be a request with similar limitations to Triple triad so you have to request the duel and it has to be accepted (add a “always decline duel requests” button in the settings). You could duel only in authorized zones. Hell it would work to even give us the chance to have a housing furnishing “ring” that would allow us to duel like the arena in the PvP zone or to buy a room in a house that would be work in the same way.
It would give players something to do, maybe even add some achievements, and enrich even the roleplay environment.