Bit of a long shot, but I had an idea, that would allow you to use certain items on zeds, so they can't bite you anymore. For example, if you had an item, such as a plastic bag, or a lampshade equipped in your primary, then you could perform an action to cover the zombie's head with said item. A plastic bag, for example, would provide ample protection from a bite, as the zombie would most likely tear through it, but a thicker item, such as a lampshade would have prevent the zombie from biting you entirely. But the zombies would still be able to scratch you. This way, if you have said items, it could greatly increase your survivability, but you still have a chance to be killed. This is only an idea, and it isn't refined, but I thought it would be nifty.