A few of my own rules

[mqstout]

a) There are plenty of fight cards that add this bonus. If you look over the board, each space covers a pretty significant area. The opposite (heroes vs zombies) also has its cards for this already. I don't like it one bit. The zombies don't need any boosts except when the players are abusing a couple tactics that come out rarely (hangar/flare gun) or awful cards (fence post).

b) Also don't like it, for the same reasons. Especially indoors there's already a hell of a lot of tension between "do I stay and search and fight or do I get the hell out of here?" There's also already enough randomness in the game -- without more.

c) This one, I think you're onto something. I don't think I feel for exactly how it's worded, but the general idea of it clicks. What about firing at zeds in the same space as the hero himself?

I don't like your card suggestions. Even ignoring that I'm not keen on your variants, most cards generally need to be fairly broad to be worth much. One of the most-discussed cards on here, "Sprained Ankle", is probably that because it's a niche card; that is, it's only marginally useful when its situation doesn't come up. (Others include "Unstoppable".) Add too many more very situational cards and you have problems.

Want an example of this? Play one of LNOE's big competitors/predecessors Zombies!!!. Nearly every item in it is specific to a tile on the board that not only has to be out, but you also have to be in that tile to use it (which may be far from where you are and need to go). In nearly all circumstances, they're worthless to draw.