My biggest pet peeves:

[Nanga]

#1: I cannot have my pet chocobo out to earn experience for it while waiting in the duty finder.
---I'm level 50 and would like to level my chocobo while I am sitting around waiting to do other level 50 stuff from the duty finder. Dumping me out of the duty finder queue for summoning my chocobo is irritating. Not being able to queue for DF while my chocobo is out is equally irritating.

#2: I cannot teleport or return from inside an inn room.
---I can literally teleport from inside anywhere else in the world, from the lower depths of hell to the highest peaks of Coerthas, but from inside an inn room...nope, some magical, mystical barrier doesn't allow it.

#3: I cannot push "R" to reply to private tells.
---Why must I type: /r ? Most of us are used to "R" doing this same thing.

#4: "Sacrifices" made to the client and servers to allow PS3 players to co-exist with PC players.
---While this/these are good ideas in theory, it really is alienating me - and a lot of others, I gather. The insane amount of zoning and loading I must do just to get through a city makes my eyes bleed. Inventory management...makes my eyes bleed.

#5: Retainers.
---Why must I have to "hire" an NPC to sell stuff for me? What prevents me from just putting things up on the auction block without having to go through a 3rd party NPC, full of extra menus and dialogues which are completely unnecessary?

#6: Animation lock, especially on limit break.
---As a Dragoon, I am no stranger to animation lock, and have grown to just deal with it. But it doesn't even fit with FF Lore that I can be locked in my Dragoon limit break animation, and the monster can move just a few feet and not get hit by my limit break because it gets interrupted for being out of range. NEVER in FF was a monster able to "escape" a Limit Break by moving out of the way. If I'm going to be locked down for the entire cast bar of the limit break, AND locked down for the animation afterwards, AND THEN the damage fires, then there should be zero chance of missing or interruption after the cast bar due to the mob moving. Do all classes even have a casting bar on their limit break?

#7: AoE on FATEs.
---This really chaps my hide having to work my tail off to tag and do enough damage to monsters during FATEs to get enough credit for a silver or gold reward, while a caster can just AoE nuke an area, tapping everything as it spawns, and cackle at not only their tapped-mob kill credit, but assured gold reward for hardly any effort. A simple solution to this would to make AoE spells/abilities NOT tap a FATE mob. It requires single-target abilities to tap them, OR the mob hitting the caster immediately after taking damage. If someone else single-target damages the mob between the AoE and the caster hit, the single-target person gets the tap.

#8: 1 gil loot in level 50 dungeons.
---Really? I mean, seriously. Things like this are why Grumpy Cat is grumpy.

#9: Reserving Instance.
---It's enough that I have to wait in a queue a long time as a DPS to even get a group, but to then wait doubly long because of instance reservation afterwards? Here's an idea: instance reservation goes in the order people join the queue, NOT once a full group is found. This fixes the problem of healers/tanks being able to "monopolize" or bully groups into doing only what they want to do, "or I'll just leave and queue again and get a group in 15 minutes immediately, while you all will have to wait an hour or more." I've also had healers say things like, "Word of advice: watch youtube before coming here next time", and then leaving immediately afterwards. This was at the very start of a dungeon, when someone said, "This is my first time here." Nothing else was said, and we hadn't even started fighting mobs yet. This wasn't the first time, and I doubt it will be the last. They know DPS have to wait forever, while tanks/healers do not, so they have the advantage when it comes to leaving if they feel like making everyone else miserable.

#10: Side Quests are not repeatable.
---What I mean by this is, every side quest should be changed to be repeatable once by every class role, and this would tremendously solve the problem of not having enough quests to viably level the other classes once you've reached 50 with your main class. It would require no additional quests added to the game. Just a flag for completion on each class of your character.

Edit: #11: Crafting in an Inn Room, not allowed.
---I would love to be able to do this in the Inn, since it's a great place to go and get away from the huge framerate lag around the cities, AND gives you access to your retainer to put things up on the market that you craft. If anyone has seen the retainer bell in cities sometimes, they are literally COVERED by people standing around them while using their own retainer, making it nearly impossible to click the bell, and laggy as heck.