Originally Posted by
Greatguardian
Care to elaborate? It's my impression that the Dev team has already said on more than one occasion that they can't access more than 160 items in two locations in the PS2 RAM at a time. That's why inventories are limited to 80 slots apiece, and you can only look at two of them at a time. Adding a new equip-ready storage option would require the game to hold 3 locations with 176 items at a time, which should be impossible based on what they've told us.
The only half-plausible solution I can think of off the top of my head is the introduction of an /equipsack command, which would only work on items in your mog sack rather than your inventory. This way, the game would still just be opening 76 items in two locations. However, you'd have to design your macros as well as your sack/inventory around which command you're going to be using for each piece. That would be a bit cumbersome.