I notice that as long as your inventory is neatly organized how you want it, then it also somewhat organizes it in trade, too. Also, if you're adding items from the drop-down menu, it's often helpful if you press the beginning letter of the item on the keyboard. Continue pressing it until if finds the item. Like if I was searching for the Yumeh Slippers. I'd press Y a few times. It'd first locate Yumeh Bats, then Yumeh Hairpin (if you have them of course), then Yumeh Slippers lastly.

As far as games go - I believe they've already got plans for some newer ones. Page twelve of this thread gives us a sneak peak at a game they're currently working on right now.