If you could add 1 thing?

[FutanXIV]

Ninja. I don't care if it's a DD or tank. Just give me Ninja. >:O lol

[Erana]

Qirqin as a playable race and probably swimming.

[KingBerry]

A real summoner

[Caedeia]

Pink Puffs.

[Abit]

The reorganization of material items so they can be sorted and placed in their respective bins or something! Like being able to organize my inventory with just a click of the button without having to manually place this here and there like what gw 2 did. I want all my weaver and goldsmith stuff close together so I don't have to look through my inventory like trying to find a needle in a hay stack. There's gotta be a way to do it, but since some materials cross intersect crafts I don't know.*sigh*

[iBerserker]

The ability to use the skill Steal or Mug, these two has always been one of my favorites in the past Final Fantasy titles!

[Returnee]

Ahem... Butt slider!!

I kid, I kid. Not that I'm against it being an option.

If I had to pick something they aren't already planning to add, I suppose I wouldn't mind seeing them add Sephiroth to the game, as a character that randomly appears and kills characters named after those in Final Fantasy 7. There's just far too many Claude Stryfes and Sepirots. Plus it'd be funny. You know it would. Eventually they'd come to fear hearing the Sephiroth theme suddenly playing in the background.

Honestly, it seems like the features I really want so far are already in the works:

Vanity slots are a big one for me; I'll admit it, I'm vain.
I'm hoping they'll allow each equipment slot to show the equipped gear, vanity gear, or (at least for non-chest, non-leg slots) no gear.

I think most of the other things I would like, I'll probably be able to implement for myself when add-ons are allowed, assuming they aren't restricted to the point of being crippled.

[Doowie]

I never said mine! For me I'd like to have raid content added

[ItsJanHi]

Allow us to send mail to our alts hjgadd gcvxddg >_<!

[Klefth]

The reintroduction of Notorious Monsters (and HNMs).

I want to actually sit on a ferry/airship while traveling. Make it it's own map, whatever, I don't need to travel over the land itself. But I loved sitting on the ferry in FFXI and running around, doing some fishing, chilling and making friends. I was so excited to do this in FFXIV, was a huge disappointment when I found out airship and ferry travel is just a cutscene.

This, too. Airships that are actually airships (not just a short CS) and ferries that don't just have an NPC named Ferry SKIPPER right next to them (feels like something out of a beta, to be honest)