I think we already have a good solution to the instance lock issue - use the same tech that you do for Featured Instances. First time you run it for the day you get a special reward. Every other time you run it you get regular chests. This incentivizes people to run it every day, but doesn't punish people too harshly who run it more than once to help friends.
Also, Vastin, it is important to differentiate between raid locks and instance loot locks. I completely support raid locks (actually, I really love the way you re-did raid locks for Abyss), but instance loot locks are another thing entirely. In my opinion, rather than help bring the community together they break it apart by making people less likely to group up at all more than once a day.
Duruleth - 130 RK, Durindor - 130 Grd, Durabow - 130 Hunter, Durselm - 130 LM, Henckel - 130 Champ, Durbear - 130 Beorning, Dursong - 130 Mins, Durburg - 130 Burg, Durscap - 130 Cpt