Using 1.5.061112
Your are able to enforce password by organization
You must define the Password policy under the organization settings :

- 2011-06-11_131140.png (48.69 KiB) Viewed 280 times
After, you just have to enable "Must use complex password" under privileges.

- 2011-06-11_131311.png (36.3 KiB) Viewed 280 times
Old passwords keep unchanged.
When trying to edit/create password the policy is enabled if user is a member of the group that have Must use complex password enabled.
Policy cannot be applied on auto create organization in public mode because the organization are not yet created.