The last page of the registration process says something akin to "Registration Complete. You may now log in. Thank you for your payment of ...". I need to change that, and skin it. How?

Second, I'm having a helluva time trying to get people logged in after they complete their registration—it seems to be a glaringly obvious feature that is lacking (among others). My question though, is if it's possible to use the CBSubs URL Integration plugin, to overcome the limitation. Specifically, can I log in the user, and redirect them to their edit profile page? It's extremely important.

One thing I did to help others login after registration, was to automatically redirect them to my login page. I went a pretty simple route by just changing the _UE_REG_COMPLETE language value to add "<META HTTP-EQUIV="Refresh" CONTENT="5; URL=http://www.yoursite.com">" with the message. This may not be exactly the right way to perform a redirect considering it should go in the head of the document but it certainly worked for me and get's the login put right in front of my users after they register. If you want to get fancier you could implement a script that runs on first login to automatically take them to the edit profile form, this is easily done with cb_subs too as there are functions setup to do this on a per plan basis.

I'm going to try this right now.

Couldn't get this to work, btw. Maybe because I wanted to make the users go to a non-secured version of the site?

If you are going from https make sure you acknowledge that in the url path you are redirecting too.

Note not to have quotes around the META tag, use the code as it shows above.

Simply add HTTP:// or HTTPS:// in front of the redirect URL, whichever one suits.