I ended up getting my fax system as described in
http://www.linuxgazette.com/issue79/fraile.html
I understand how PAM works, however. I could get samba and winbind to join an NT domain, I could also list users and groups from my NT domain. I could not however get those accounts to list as local accounts which is needed by samba for authentication purposes.
Winbind can be compiled with PAM and NIS to create a moduel that does that sort of authentication. After this past week, I am convinced that this task would have been a lot of extra and needless work for me. I love slackware like an only child, but I decided that a stripped down version of Fedora was probably my best option.
On a side note, I got a windows Fax solution now, built on Linux.
Windows users can print anything they wish to a samba accessible printershare. They install any postscript driver they want, and print.
Moments later they get an email containing a hyperlink. They click it and are taken to a custom page where they can enter a phone number and selecta cover page. Upon submission that user is then kept up to date on the status of their fax. They get failure and or confirmation emails.
All in all I would give this system a huge thumbs up. It will save my company thousands of dollars, adn work better than any commercial offering I have seen!
I did run into a lot of trouble with the smbfax software on Fedora and the way the scripts wanted to execute system commands. Fedora was too picky and didn't like setuid perl. I ended up rewriting what was almost the entire smbfax suite to be compliant with what should be almost any Linus OS.
The only downer about this solution is that you must maintain an up-to-date alias list for which to send emails to windows users.