But anyway, yeah I've taken the bandit base in vanilla. The stalkers hold it as well, managing to suppress any insurgencies by themselves. And then no more bandits (until Limansk bridge I think. As you'd expect).
It was annoying to do. You have to get them to cross in from Agroprom (that might be obvious. Can't remember), which at the time meant taking the Agroprom side camp from Duty, who were their friends and mine at the time.
Talk about awkward.
I was last trying to coax Duty into doing it when I was playing with Complete, but I couldn't manage it. They were content to occupy the nearby camps and then just massacre the bandits whenever they came out (hours of fun to watch). Bases seem to be faction specific goals and the bandit base is the Loners ultimate target. I was mainly hoping they'd change the radio station, but they don't, dammit all.