You better suggest this on the FOnline.ru forum, since it's a direct engine feauture and probably needs cvet to adjust. The screen can't get zoomed out near map borders due to the screenblockers around the map which do not allow the player to look farther than them (some bugs are notably exceptions). I personally never zoom out/in because it just looks ugly and wrong, but if you use it more often, as said the fonline.ru forum is the way to go.