If Square-Enix directly asked you for suggestions...

[LastFireAce]

Let BRD summon a piano in the battlefield.

[DrWho2010]

Merit points.
Everytime we do a dungeon or weekly tomes or weekly raids or savage lets get an extra bonus.
Let’s use these points to customize our characters. Like 10 merit points increases ruin damage by 1% for smn. Or another smn uses it to increase bio damage etc.

hmmm lets punish ppl that don't play as hardcore/as much as casuals by not making them as effective. yeah no to this.

[Fredco191]

Saxophones for Bards.

[Ennear]

One thing I would certainly like, is making SCH Fairies and SMN Egis a slightly limited uptime but more active role.
The way I'm thinking, is sort of like, for SCH, in PVP, you use your Faerie Gauge to actively Summon your Faerie who then helps you be casting embrace after every action on an ally, effectively increasing the potency of all your heals by 300. You could also have the faerie abilities be more impactful as a active command consuming some gauge.
So say, Eos could cast "Medica II" and "PVP protect"
or Selene could cast "Expanded Arrow" and Aoe "Esuna" with a brief "Veil" (status protection buff from FF XIII)
it would all be balanced by the amount of Faerie Gauge you can generate and knowing when's the proper time to call for their aid.

Something similar for SMN, where you would build up some kind gauge to feed your pet, and as you use aetherflows and trances, the tier of the egi summons you utilize go up and up all the way to Demi-Bahamut levels.
Each egi would have a sort of mechanic, where say,
with Ifrit/melee egis, whenever one of your ruins crit, they also throw out a big special punch.
with garuda/caster egis, whenever one of your dots crit, they also throw out an aoe bonus spell
and say with titan/tank egis, whenever you cast an aetherflow action, they restore some hp and gain damage mitigation?
naturally as with the SCH fairies, they would each have their own special abilities that cost some gauge to execute.

These are all just ideas, random ideas, but something I hope putting out there could help make things more fun.

[ChaoticCrimson]

Let BRD summon a piano in the battlefield.

Added bonus if they can use it to summon Billy Joel with it

[Riko_Futatabi]

I want SE to develop their own free VPN! Ahahaha, madness!

[Chiramu]

Square Enix asking people outside of the company for assistance of any kind XD. That is a pretty good joke. Square Enix doesn't even read Youtube comments about what they can think about when developing their mobile games(the ones that they want to use to mirror the monetary successes of Hearthstone and League of Legends XD).

If Square wanted to improve this game with community assistance then they would have a public test realm. Also they could pay the top raiding guilds in the game to run their raids/dungeons/trials and tell them what they think. Players always play to break a game, developers never play to break their games. A player will always find the easiest way of approaching a situation, using bugs, glitches, anything you can think of.

[akaneakki]

Funny enough, the Darklight tanking set had that in 1.2x:


(Left picture is 1.2x and right picture is 2.x)

Wow that's neat. 1.xx had a lot of more details etc, but it's funny how they wanted that to be on ps3 when 2.xx barely worked on it haha.

[Aronys]

Lootboxes. I mean, everyone else is doing it, lol. Pay $2.00 for a lootbox that can give you either a mog station dye or a fantasia. Mostly dyes, but there's a rare chance of a fantasia.

No, please don't listen to me, this is a horrible idea. Though, how things are going, I wouldn't be surprised if it happened even without our input.

[akaneakki]

Lootboxes. I mean, everyone else is doing it, lol. Pay $2.00 for a lootbox that can give you either a mog station dye or a fantasia. Mostly dyes, but there's a rare chance of a fantasia.

No, please don't listen to me, this is a horrible idea. Though, how things are going, I wouldn't be surprised if it happened even without our input.

Oh god, don't give them ideas. Lootboxes works fine in F2p games tho.