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!
Are you going us to allow to select which buffs to hide? For example i would be quite happy if i will not be shown the target class buffs and medals.