http://i63.tinypic.com/547ywm.jpg
See the Orange names? These you can attack anytime, anywhere. No MR needed, you don't go red, you don't lose possi's.
Want to kill anyone outside of war? Either declare war, or use your 5 possi's.
I don't quite see the issue here. If AoE is bugged, then send a ticket and get it either fixed or ignored. The first since it's Beta, the latter since it's PWi.
If this is the new system, I can perfectly live well with it since it gives what everyone cried for: unlimited pvp except in cities.
You can war as many guilds you want with zero penalties other than 24/7 kos.