Both of my main guilds (one of which is Arclight's) raid 12 for loot and 14 with just 1 low-level hero for XP and dailies. Took us a few runs to get everyone in line, for sure. It also helped expose people who weren't listening to rules and as we filtered them out, we got even better as a guild. If our leadership could have seen overall raid dmg, it would absolutely have made that process easier. That would be a welcome addition!
While that approach is effective, it would be awesome to not have to 'game the system. And it would be great to have more than 1 raid dungeon to work on every day. Raids are fun!
I completely agree about GMs/Elders being able to move teams around in GWs. Would solve a lot of minor communication issues. Good idea!