I think it'd be cool if villagers ran away from you when you were infected, like a zombie, and Iron Golems would attack you on sight.
Makes getting that cure harder. (if you can get it through trading)
We were thinking about doing the trading with villagers idea at one point, but we weren't able to do it because the code for the villagers isn't currently updated on Forge for 1.8, this might be a possibility if we make our own trading method, but it sounds like a cool idea, thanks for submitting it. =)