This is a good idea, but in my opinion executed poorly. Having to go through and sort everything by hand almost seems more difficult and time consuming than just adding someone on the list we already have. Plus, as you stated before, idiots are going to abuse this and make stupid entries. It would be grandiose to see this actually done, but someone with know-how in Java or PHP should make a website or link off of theirs and do this right.
It's a shame. Someone good uses their talent to make something to help us, and idiots have to go and abuse it.
This isn't that hard to do. Google Forms is a really intuitive way to, well, do forms and the like. You don't have to be technically minded at all, it's almost a more useful version of the polling system we have.