Possible settings option?

I think it would be a good idea to set a time frame for people to allow somebody to follow them. I have blocked just about every person that has started following me because I don't think that they are even reading my tweets. If they were, they would have noticed the posts that say "message me first or I will block you." Is there a term for people following well over 30,000 people? I know they are not reading all those posts.

An option to allow people to follow would be an excellent feature to add. Maybe a timeframe e.g. if I have not allowed a person to follow in X amount of days they are removed from my list. This would be an excellent way for people to keep their account spam free.

Just an idea.....Thanks for reading.

- Solucid