Forum OpenACS Development: Re: How to do sessions
I've many times had that "this is junk" feeling when staring at a big pile of foreign code that I wanted to make do something new, but more often than not, as I learned how it actually worked, I realized it wasn't junk at all. Modifying and refactoring old known-working code never sounds as much fun as writing something new "from scratch", but it's usually the more effective approach. (You're unlikely to really understand the problem until you've worked with the old code.) This is only more true when the existing code is both battle tested and friendly to modification, like OpenACS.
Taking a rather large toolkit like OpenACS, and then deciding to write your own users table from scratch, is, as anything other than an academic or tutorial exercise, a pretty strange approach. OpenACS's single biggest strength is arguably its well thought-out data model, so totally ignoring a core part of it like the users table makes no sense.
You'd probably have been better off explaining what custom behavior you want your site's "login and registration system" to have, and how you're having trouble using OpenACS to do it. Since you didn't tell anyone what your actual goal is, you're a lot less likely to get the advice that would be most effective in solving your problem.