Jeremy,
Glad you're making progress. For the authentication, that's something I hope that Mijosoft can help with. Definitely let us know how that goes.
I'm not sure what you mean about the redirection issue. Are you saying that the page the user goes to isn't what you expect, or simply that the "Profile successfully connected" message isn't being displayed and you expect it.
Finally, as for the mapping, that's up in the air for anyone that wants to do it
We have a few profile plugins on our radar that we want to release over the next few months, but Mijoshop integration isn't on the short-list for now. We're also in the planning stages of revamping the profile plugins to make them simpler to create. Once that's done, we're hoping more extension developers will be interested in creating their own profile plugins for easier integration.
Hope that helps,
Alex