Make the Mog House bigger! Add a couple of few rooms (perhaps through quests/NM hunting as per Synthetic Atma and gil expenditure or crafting).

Enable us to store Ex items in it on an unlimited basis.

Share this expanded house with all characters on the account (compliments the forthcoming Ex item sharing w/chars on yr account).

Be able to put weapons/armour on racks around the place as standard (without having to buy mannequins, or have them take up so much floorspace).

Overall furniture placement limited by visible floorspace rather than take up slots in the Mog House (bearing in mind that you'd still have to balance out your Moghancements).

idk, I just feel a little cooped up being a champion of Vana'Diel and having such a small room

Also, slightly sad that the majority of my event furniture sits in the event item storer.