Its is a fundamental flaw of the DF engine and is nothing new at all.
You can improve your chances of seeing through walls with a scope by lowering your resolution.
Some people like to refer to it as a wall cheat if you blast them with a barrat through the head when they are squating in a barn but its a normal part of DFLW.
Pretty much if you can see the dot without a scope you will be able to see the whole dude with a scope.
Its all part if the item based maps that DFLW uses.
Other games build their maps by scraping out the map from solid block and colouring in the walls.
This method looks great but limits the size of the map and couses graphic lag online.
Its a minor problem and to be honest if you can see someone who is just sat in a house then its fair game to use a high penetration weapon like the Barrat or FNMAG or if the wall is stone an AT4 and kick their camping asses out of their.
