Hey Matt - It's good that you're already thinking of possible ways to improve PSC. But you can already direct people to your non-PSC porfolio through the "Website" space in your profile. You'd just need to find a site on which to host the porfolio, then you can link it through your profile. I know i've checked out many peoples' non-PSC portfolios that way.
If you mean it should be hosted here on PSC, i don't know if that'd be a good idea. First of all, it'd use up a lot of bandwidth. Considering how many people here are professional graphic designers they could have scores of images to upload. And after all, this
is a site specifically for PSC, not for general graphic design work. I think using your PSC profile to link to your outside portfolio is much simpler and more efficient. Just my two cents.
Edit: On second thought...if you're only talking about posting a few picks of your own, then you can certainly do that on a forum thread or in the chat room. If you're talking about allowing everyone to permanently host their non-PSC work here, then the first couple paragraphs still apply.