Returning to the point about pre-registration, the proposed changes are fine for the Classic and US versions of the game.
I don't think it will work on the EU version of the server, players won't want to play if they can't get into their preferred choice of region and will get fed up and stop playing. I understand about balancing and spreading people around, just don't think this is going to work in the EU version. It would be different if it were possible to change region, but it isn't and everything in the EU game is based around your region.
I know some others think that mega-regions aren't good for the server and would agree with that, but I think this should be left to players to decide for themselves and not be forced into boxes they can't move out of for the whole round. I play with a medium sized group of associations who have fun playing together and enjoy a competitive round with similar groups. We welcome new members as individuals, but don't often team up with other associations as we want the server we're playing on to remain competitive and not become dominated by one mega-region who win every time, else the game gets boring...
A good server has to have competition in it, but not in a way that will take all the fun out of the game because you have to rebuild a team every round.