PQI + other quest integration: I have a PQI for Creeplight Ruins, and also have an Unlikely Heroes quest still sitting around that I just can't be bothered doing. If the PQI was asking me to complete it with one of the combinations that the other quest is asking for, I'd be more inclined to get them done. It'd also just feel "nice".
Music and dungeon restarts: when restarting a dungeon, the music also resets. Kind of annoying. I'd like it if the music wasn't interrupted if not leaving the dungeon.