1. Food/elixirs and potions
Let us buy stacks of 100. The cost is meaningless since gold is useless, so why not add stacks of 100 or even more of these? Easily purchaseable in a few clicks.
2. Allow players to transmogrify legendary items, but keep the transmogrification rules. Plate on plate, cloth on cloth, weapons of the same kind to weapons of the same kind etc
3. In RBGs, if a team is about to lose, they can just all leave the BG and the winning side will not earn any points. This wastes everyone's time and players aren't keen on doing rated battlegrounds anymore. Fix this, please!
4. Fix the ignore function. It's still not working.
5. Install a counter to flooding. If you spam the same line more then 5 times in a timespan of 10 seconds, you get auto-muted for flooding. While there are moderators and GMs present to apply punishments, we aren't always there. Such a measure would make the process of muting flooders automatic, saving staff some time and saving players from an eventual frustration.
6. Consider giving moderators a way to view the opposite side's chat channels.
7. Make Tome of the Clear Mind a one-buy-infinite-stack item, so you only need to buy one and you can change talents and glyphs freely.
8. Make leveling professions instant.
9. Increase the penalty for cheating to 90 days or IP bans/permanent bans.
10. Give me cake!