It would be wonderful to see TW matchups factoring in the average GAC rating of those registered. My guild has found that matchups between guilds with no more than a 100 point difference in average GAC rating seem to be well balanced (winnable by either guild).
And it would help to allow players to use a raid damage score from a previous raid to log damage with the same team in a new raid without having to run the battle. It would even be helpful if you only allowed us to log the lowest or average of the six previous attempts.