Here’s just some quality-of-life changes I think most people would like:
-Add at least one more map to Duel, this doesn’t have to be a new one, it could just be one copied from the PvP duel arenas.
-Have a short intermission time between rounds, during which players can vote for one of these maps, instead of having it be automatically selected.
-Have both players heal to max health upon entering a match.
-Permabuff most potion buffs, like how it is in PvP FFA (this one is debatable)
-If Duels eventually becomes a “real” gamemode like Zombies, then there will probably be a lot more Guests and Members playing it. I suggest that there should be some kind of quick-loadout that you can apply easily (like a chest) that is removed at the end of the match (that would be available to Guests as well). Without this, it’s likely there might be a lot of people fighting against new players who just jumped in the pool with a copper shortsword.
-There could also be more loadout chests for members to save their loadouts in to quickly swap to (in intermission).