what those sandbag do.. basically, force all outside ai(that are not on the mountain) to come by the 2 entrance so its easyer to defend ourself, for those on the mountain well we can easily hide and shot them
from inside,
for the bandit spawning inside.. i think you can ''remove'' area for spawning ai whit the new ai we got.. so at least that would force ai to spawn outside the trader area
i would have build the wall but cant build in city