hm, it seems the whitelist/blacklist does work.
After removing the names from the whitelist and restarting the browser, Badspot (and co.) are no longer unblockable. I would assume that adding names to the blacklist and restarting the browser automatically blocks them as well, but I'm not entirely sure.
Eitherway, this discovery intrigues me and I'm going to continue screwing around. c: