I'm Cory Kolek, also a UI programmer here at Bioware Austin. I originally implemented the UI Customization feature, and I'm always looking for ways to improve it. I just finished adding the option to change the scale of your buffs and debuffs within the operation, party, player, and target frames. This change has recently entered testing, so look forward to it in a future Game Update!
Don't know if anyone has mentioned it already or if it's already on your list of upgrades, but I would really love if my keybinds could be saved and loaded like the Interface Editior.
I roll alts out the *** so it gets tedious to have to redo all my keybinds a billion times.