While playing I had a few ideas I wanted to share. Nothing too special, just what came to mind.

1. Music on mounts matching their respective boss/location. Essentially the behemoth mount having the music from King Behemoth and Ahriman having the music from Dzemael Darkhold.

2. A server-wide quest to repair Ishgard. Wasn't going to say this because I feel it may be a future plot point, but a community repair quest sounds fun to me. Essentially a donation of materials for exp and gil for each crafting and gathering class in order to fix the broken city. Doing a certain amount could reward one with a snow golem mount or minion of Edmont de Fortemps.

3. Ability to edit your visibility settings in the player finder. Gil sellers quite often use the player finder in order to spam their RMT messages to the entire area, this would help cut down on both the complaints and the sellers themselves.