I agree with all of the above, perhap's these special infected could have athlete skin's or something, i think scope glint's are good too, perhap's bird's rising from the tree's when shot's are fired?
I disagree with head shot zombies, the infected just need to be made tougher (Withstand more weapon damage) in my opinion head shot zombies are unrealistic, how about give server maker's the option of what zombie they want to have in-game? Head shot shufflers or fast-moving scary infected
i'd love to see something like tin can noise trap's, i make camp in the building site at cherno and i'd love to put up tin can's on string to make noise when someone walked in, or maybe even metro2033 stye swnging-log with spikes