I think a great idea to get around this and make W4 completely unque, would be to drop the Texas Revolution out of fort battles and add field battles, new battle grounds, I have alot of great idea's around this.
Wouldn't cost any cash to start a field battle, the battle would appear like a quest giver (maybe in more than one place, being able to sign up for the same battle, after all we want to bring this world alive, why make players, travel best part of the day)
Some of the maps will have forts, where as others will be completely field maps, with obstacles, such as rivers (which may have a bridge to cross), mountians. Maybe a layout of a town with one side starting off in the town. Town buildings will offer more protection like buildings in forts.
Though I also thought why not add afew turned over wagons, walls/trenches, barrels/crates (which only offer very little protection.)
Clearly nothign to be won at a field battle except XP and maybe finding something and getting one over the Mexican's/Texan's
Can say if this would help/hurt the world though, definetly would be alot different.