Password policy possible? Minimum length and so on?

Hi all,

I would like to harden my Gallery2 page a little bit more. Is there a way to force a password policy for the user accounts?
I.e. minimum password length (preferred: 8 or 9), also alphanumeric etc.

Thanks for your help.

Kind regards
(linux newbie)

Gallery version = 2.2.4 core 1.2.0.6
PHP version = 5.2.4-2ubuntu5.6 apache2handler
Webserver = Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.6 with Suhosin-Patch
Database = mysqli 5.0.51a-3ubuntu5.4, lock.system=flock
Toolkits = Dcraw, Ffmpeg, ImageMagick, LinkItemToolkit, Thumbnail, NetPBM, SquareThumb
Acceleration = full/900, full/900
Operating system = Linux obelix 2.6.24-23-server #1 SMP Thu Nov 27 19:19:15 UTC 2008 i686
Default theme = matrix
gettext = enabled
Locale = de_DE
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11