As long as we're going back and revamping the tribal quests and the ARR content to streamline the flow and add more drama to certain moments...
I think it'd be good for ARR's combat-job tribes to be brought in line with the rest. Having the 4 of them use 40-50 Level Scaling rather than being flat levels would be a notable improvement to the feel of the quest lines, and potentially a boost to people's xp to get them into the more recent fare.
The Ectahl Nine probably ought to stay as it is, considering its scaling style is so different from the rest, running all the way from 1 to 50.