Shorter Rage List? (Battle)

Does anybody know how Brave New World's crew went about shortening the scroll on battle's RAGE list?

I was able to follow the C3 menu shortening fairly easily (reduced it to 48 rages), but I can't work out how to shorten the list in battle.  I can get it to list only the first 49 rages (which admittedly is a problem, but not an insurmountable one), but then there's a bunch of dead scrolling space beyond it.

I was hoping to shorten the list to help completionists and to make the Jiujitsu upgrade more powerful (since it would hypothetically draw from all 255 rages instead of the first 48).  I can't figure out what controls the scrollbars in battle, though.