There should be a new item that could come from a rofl. I have come up with the idea that the new item should be a potion. I don't know which potion should be added, so I'll let the community pick.
Strength, it helps the human better. Harming and poison is useless since your probably gonna end up getting yourself :p
I would say potion of strength. I don't play infections that much but i recommend it, it helps with they're pvp skills and by having potions like harming and poison would be useful to have on your opponent but don't hit yourself with it :P
Zombies have speed 3, humans would get speed 1. And the potion of Harming and the potion of Poison would be like a snowball, they won't effect other humans. But I see where you'read coming from. There is already Gapples to help with restoring health. I don't think humans need two.