GC airships seems to have been all but forgotten, would be nice if it got regular updates similar to the GC submarine.

Chocobo companion could use an update on the skills, it still has accuracy skills. Could also use some new companions.

Not update feature, but would love an emote sync option for dances and such so I don't have to eye-ball when to start a dance to be in sync with someone else. Even OG Guild Wars had this in 2005.