Discord while playing games
I do not yet have a quest, but with friends getting one and I myself planning on getting one in the future, I think it would be great to be able to have discord on the quest! Now that wouldn't be extremely hard to do but it would also be awesome to be able to talk to your friends while in game! This would also require support for things to be ran in the background but I think it would be possible!
The Quest already has built in party chat.