[Mediawiki-l] is there a good way to enforce a password policy?

Hello all, is there a good (and not to time consuming) way to enforce a password policy to users of a closed MediaWiki-wiki? My only fast idea (without touching code) would be to remove access to the Spezial:Preferences for normal users, which does not feels very elegant (but we could assign passwords, which is at least a solution against to easy passwords). If somebody has some pointers to more elegant ideas or documents (or better keywords to find the abundant information), I'd appreciate it! Otherwise my poor users will get the less elegant solution (which should work, but I've not tested it, yet). best wishes, Hella