We play multiplayer like this:
Everybody has the same dungeon at he beginning (same setup: rooms, chests, gold).
One player always takes care off rolling the 3 dice and all players in play order (or at the same time) assign the dice on their sheets. Then battle in play order.
We find it makes the game a little more interactive/competitive when you complete the same dungeon.
That is a great way to play. I will look at adding that as an option for multiplayer play when I rewrite the rules in December.