Haven't seen this suggested yet but would personally love to see a few things:

1) Checking my stash from the menu screen - I love Darada and Amira and all them but it would be nice to be able to stash and unstash without entering a town. Just for sheer convenience.

2) The ability to switch item load outs on the fly - This could be hard to implement without hot keys but I'd love to be able to go from one equip set to another without entering the menu. I realize this would change some game mechanics but I think it would be for the better and it would also perhaps inject some life into PvP.

3) Auto Follow and/or Auto Run - Convenient in so many ways and will increase the life of your touch screen. Although could be abused for power leveling etc.

4) Crafting - I would like the ability to craft elixirs etc. This isn't as important to me as the others but it would make it much more interesting/compelling for me.

Hope I'm not restating anything that's been discussed. Thank you for making a highly enjoyable game that will surely ruin the eyes of people everywhere :P