In regard to when not to include negative dice in a pool....do you all always have your players roll at least 1 negative die when facing zombies due to their horrifying feature or sometimes if the situation warrants do your players not have to have a negative die in their pools when facing a zombie or zombie(s) in terms of attacking them?
Also
What do you do if when you give experience for advancement the players allow a character to have a positive feature that is almost identical to one he/she already has? The book says if you get the same feature again you instead increase the governing attribute. For example: in my game we have a player who is very focused on being a melee machine. He wields a fireaxe and kills a lot of zombies. It is rather insane. He has a positive feature called CQC (Close Quarters Combat) Training. He uses this when wielding melee weapons. He was later allowed to add another positive feature called Melee Happy which he was also using to get another positive die when attacking with melee weapons. This should not be allowed by the rules because this second feature does essentially the same thing as the first one, right?