Not a suggestion for an in-game feature, but more for an external feature.
I'd love to see an externally accessible API that the community could use to develop some tools for the player base. That way it wouldn't take dev time to create the UI for some of these things, and the players could use some of their RL skills to help the community as a whole.
Just some things I was thinking of off the top of my head:
1) Consigner Search - There's a tool on the website now, but it doesn't appear to return all results.
2) Population Data:
- Be able to see how many people are online
- Be able to see how many characters there are of each race/school, overall, online right now, etc
3) Item Data:
- Lists of spells/techniques/armor/weapons/etc
- Be able to search your character name and see what spells you already have, and which ones you need
4) World Projects
- List any remaining world projects, and what their completion rate is
- We might want to keep the location of unstarted projects a secret, for the community to discover, so perhaps only display those where someone has started to rebuild them.
That's just a quick brainstorm off the top of my head. I know there are a few other games out there that offer external tools like this for the player base, and I for one would love the chance to put together a site with these tools, and anything else the player base wants.
Just my personal pipe dream