Post Indexer Suggestion: Max number of Tags and Categories

Greets:

Just a quick suggestion for the Post Indexer Plugin to have a setting where if a post has more than 'x' number of tags and/ or categories, for the Post not to be indexed. I know wp.com has this features. They justify it due to tag spammers who throw in dozens if not hundreds of unrelated tags onto a Post in an attempt to draw people in.

Thanks,
-drmike