Well ultimately I am pretty sure they can enable the wall sections to be build freely
the Orcs got an partly free building system so the necessary codelines are existing already for this
problem would be the interface side
to enable the player to build an Wall freely there would be some additions to the current system needed
1. they would need to change the Button for Inner War Upgrade into an Build Button for 1. Wall Section which you can Place Freely
2. they would need to put in some Script which will force you to connect any build wall to an already existing one
3. they would need to create an own wallbuilding interface in which you fully build the wall and close it BEFORE it actually starts building (this serves not only so you actually see immediately how it will look later on but will also prevent people from accidently leaving holes in their wall
4. they would need to create an extra empty space or bridge field to cross rivers and other impassable terrains where you cant build a wall
so its actually a bit of work :P
but it would be possible in my eyes
In the Shadow of the Black Cross. We Fullfill our Duty in your Name.
And Look forward to the Day we Return to your side Silvanos.
Watching over our Comrades as they Fullfill their Duty in your Name.