There is an issue with mounting barbed wire on walls as they are impossible to find when laying on the ground.
Please make another solution for this, I have seen you have added the option to combine the pliers with the barbed wire by holding circle, but nothing happens. That would, in my opinion, be the absolute best.
And... Please make walls 5-10 times stronger and metal walls 15 times stronger. Its so boring to build a nice base for a month just to get blown up in 5 minutes no matter what you do :)