I found the recent update to be downgrading...
I would like to keep RB as zoom as well as heavy attack.
It also appears that the FPS has got worse and zombies go through closed doors.
In the middle of combat my game froze for 3 seconds and i was shot by a mosin because the opposing player's game didn't freeze so he/she was able to bring my health to blinking. When i finally killed the player I limped into a nearby house and locked the doors to bandage but zombies came through the doors and surrounded me and because my inventory was full I wasn't able to reload and save myself.
There are too many zombies and they detect you too easily.