For this functionality, it's only one list per account. So if an individual wanted multiple lists, they would need to create multiple accounts (potentially linking them in some advertised way if that was desired).
That's a clever solution!
Are you planning to run your own BL?
I hadn't really planned on it, since I figured other people would do it.
But we do maintain an internal blacklist at BlockTrades to try to prevent users from accidentally sending to phishing accounts similar to exchange accounts and hive services (and also some accounts that have tricked people into giving up their account keys), which we could publish.
I'd guess that some of the bigger blacklists will already cover those accounts. But maybe it would be useful to publish it for someone who just wanted to blacklist those accounts and no others. I guess we'll wait to see what decentralized lists emerge, then decided it if would be useful to do it or not.