+1 to full-shared XP option. It's annoying that I feel like we have to stay as a group in a game that promotes freedom to split up, even if we're 100% cooperative.

If a full-shared XP option is hard to implement, something like an option for every character leveling up when one levels up would be nice too. This isn't the best either, since you can still split XP up and level up slower, but it would help.