[doreto]

I won't go and search it for you because you are lazy but i will tell you how to make it yourself

1.in OnPlayerStateChange check if player press shift(or any other key you want)
2.check if time passed from last time used jump and if passed and player is in zombi team SetPlayerVelocity z hight
3 store last time used jump from gettime() (no need for timers)