The capacity in the barricade building file doesn't actually do anything as far as I have noticed. In order to change the amount of deployment points, you need to change the main scripts in the .dll files using something like dnSpy.
Specifically, it's in "SeqScripts", in the "Party" class and there's a function called "DeploymentCap" that literally just returns the number 10 by default. You can change that number to whatever you want in order to increase/decrease your deployment limits.
Technically, if someone wanted to get stuff to be a bit more advanced, they could even hijack that function to reference some other variables to allow for some method to increase deployment caps, but that would obviously require some degree of coding knowledge.