Please don't develop methods to activate dormant characteristics in humans such as over-sized jaws, long sharp fangs, abnormally sized eyeballs and pointy ears. We all know that Twilight fans, Trekkies, anime cosplayers and various assorted wankers would abuse this science.

That they wouldn't be able to pass these characteristics on to their offspring would be the very least we could then hope for! (then again you may ask, what offspring?)