Force a specific password strength

[StNickZA]

I made a few accounts on my server for friends of mine, and in the interest of security, I gave them all 16-digit randomly generated passwords. Of course, the very first thing they did was go and change the password to something they could easily remember.

I don't want to lock them out of all the other settings with the "User is allowed to change settings and password" option, so I think a handy feature would be the ability to specify a minimum strength password, and if possible, an option to force someone to change their password.