I kind of think a good idea for a function on this site would be to allow users to block certain actors from being suggested to stories. This would allow us to not have to block people after the fact and then unblock them if they add an unwanted role to a story.
Blocking Suggestions instead of users
I definitely agree with this! This would also help immensely with sockpuppet accounts suggesting the same particular role over and over again (something I've had trouble with personally, and I know other people have too).
When I joined MyCast, unfortunately i used to do this kind of thing, but got real and realized i was being a pain in the ass. Got better and I don't do that anymore.