The connect community, is this an incorporated business with a trademark?
I mesh another website with my ning site for the social aspect without SSO.
Everything on my non-ning site doesn't really need to have signed-in members (My ning site is open to the public too). Although it would be nice if I could embed a ning comment box, like a widget, that would auto add the comments to the latest activity on my ning site. This widget was something I asked for a couple of years ago and Ning said they'd get around to it.
There are certain pages that I wanted only signed in members to view (like my beach webcams) that were on my non-ning site so I duplicated it by creating it on ning, checked the box for "Signed-in Members", then 404 redirected the old page to the new ning page.