I really love how people will immediately assume anyone claiming to have been on the bad end of a hack is FOS or just a poor player. Google DAYZ standalone hack, or get creative and search a certain kind after browsing the 300,000 hits off the first search. These "people" even have facebook pages for the stuff. When a player can call you out by name in a full 40 man server then proceed to shoot you through a building, wall and roof included, from a blind spot - I'd say at least ESP was used here.