I'd be concerned about bringing up repeat suggestions, but hopefully more people asking for it will maybe bump it up on the priority list.

A quote function would be very appreciated. It would vastly improve engagement, since people would actually be notified when another user is initiating conversation with them. I don't know if its a retro thing, but I feel like quoting/replies are pretty standard for any forum.

Another would be the ability to watch a thread and be notified when a thread has been bumped since you last checked it. That's especially important for the health of forum adventures.

At the moment, it seems like you only get notified when someone posts in a thread you've created, which probably won't serve much of a purpose for most users! Moreover, it seems like you actually can't opt out of receiving these notifications.