If you could add 1 thing?

[silentwindfr]

a Two handed sword class!!!! and a twin dagger...

[Raseru]

I'd like the ability to dye ALL armor. Being unable to dye unique armor is relatively disappointing. Tell me it wouldn't be awesome to be a Lancer in Red or Green armor instead of just dark purple. Or a Scholar in White Battlemage gear.

[punchbunny]

Clickable aetheryte hubs, or at least names when you hover over them. Or, the ability to travel to any aetheryte crystal within that city from the main city crystal, rather than having to run to the closest little one. Small things, but it'd be nice.

Oh, and the ability to see current gear compared to the gear you're hovering over. Sometimes (okay, most times), I care more about defense/magic defense when selecting new gear swaps. ESPECIALLY when on a crafting/gathering class.

[Buddhsie]

Or, the ability to travel to any aetheryte crystal within that city from the main city crystal, rather than having to run to the closest little one. Small things, but it'd be nice.

Congratulations this is already in the game!

[Calypsx]

Dancer tank. We need more tanks and healers.

or a new beast race like Bangaa's, I would love to play something with scales.

[Dyne_Fellpool]

"instant" abilities to apply their damage/heal/whatever instantly, and not be delayed by animations

[rabbitzero]

Dress-spheres from FFX-2. Yes, i'm serious.

[Kahlyn]

Skill chains/renkei. Limit breaks just seem too... easy? I know that pulling off a skill chain in FFXI took practice, but I really liked how it got players to coordinate rather than just spamming attacks.

Aside from that - I want to be a thief

[Goran]

I would love to see races that aren't so close to human looking.
Like the Bangaa or Nu Mou in the Ivalice games. Or even a playable race of Moogle like creatures.

[Toukai]

Epic/legendary crafting recipes. Something on par or better than current Dungeon gear you buy with tomes. You know, make crafters at 50 kinda relevant.

Maybe recipes requiring parts from bosses from fates/dungeons. This would require certain fates to drop items guaranteed to those with Gold medals in the fate.
Dungeon bosses can have a chance to drop them outside of the coffer that drops when you clear it, perhaps a guaranteed item drop if cleared quickly and everyone can greed on it. This means even level capped dungeons can be something everyone can do more than once for their story as a means to generate gil etc.

This way battle classes can sell them on the market to make some gil since there are no real ways to generate gil comfortably at 50, and crafters can spend some of the money we've racked up from selling our wares on the market place. And then those sick of the grind or stocking up gil can buy this gear and be happy they dont have to grind AK anymore.