por DanDan » Lun Sep 29, 2014 14:52
My suggestions:
Fortress weakened, but still have decent extra upgrades/storage/population;
Binding is permanent, castles must be very very close, but still there after fortress completion;
You can choose upgrade fortress to offensive or defensive type, so binding castle troops can have attack or defend bonus.
Do not turn binding castles into free castles, or it will just cause chaos.