Bob, I'm not really that familiar with the portal and web generator, but the answer is yes... almost anything can be done with enough work. The question is how much work it would be. (Sorry, I'm being pedantic). I'm not really qualified to answer that question. I am porting our ACS 3.4 Oracle site to OpenACS 4.6or7 Postgres, and that is a pretty large job, but probably worth the thousands of dollars we'll save in license fees.
Plus, you get a lot of fringe benefits being part of the OpenACS "code stream".
