I wish that the mog sack, locker etc would have the possibility of auto sort. For crafting it would be wonderful if we could have bigger stacks. I dont know why logs couldnt be stacked. Making something like shihei takes a lot of room just to get started. Its a royal pain. I have a mule just to hold shihei materials. Just to make a few toolbags is daunting for space especially since the new abyssea gear and items takes so much room.
Making linkshells key items would be lovely. It would have to be done a bit differently or you would have all your pearls showing in the linkshell list every time you went to the selection menu. It would also have to have a delete feature both for you and for the sackholders to bust. MIght just be too much work.