Hello ricardoandrade,
I see that at least one other site has placed through an Enhancement Request with Support for similar functionality. You may wish to do the same.
CAT Services can assist with customisation in this area, if needed. Of course, any feedback on answering the original query is welcome.
Or they may be able to suggest an alternate authentication method that would work in your environment for this subset of users. Then you may use the tools of that authentication to enforce password policy. This may be an authentication method different from what is used for the bulk of your users, but suitable for this sub-set. There often are other ways to achieve login security.
I assume that there is some reason that your main authentication method is not being used? It goes without saying that storing user passwords in clear text is not ideal. You only have to look at the media attention that a big social networking site attracted in the past week when "hashed" passwords were recovered. Admittedly this was a very high profile company, and the number of accounts released was huge, but still - the days of clear text passwords should be numbered.
Anyone else can help with the original query?
Thanks, Kyle_R.