1) Actually, I though JomSocial does do a multi-page registration. The first page, you select your username, password, and email (the normal Joomla stuff), then you select your profile type, then you fill out the fields for that profile type. Not sure if that's changed, or how you hacked things differently. If you can explain a little more what you're going for, that would help. Specifically, if there's something you see lacking from our registration page that your multi-page system offers, let us know. Right now, I'm just a little confused what you're looking for.. other than having registration spread over a few pages.
2) Depending on how you want to do it, the template file that displays the multi-profile stuff during registration is in the /profiles/jfbcprofiles/jomsocial/jomsocial.php file. There's a function in there called "jfbcProfilesOnShowRegisterForm()" that builds up the extra fields to display, and there's a section in there (~line 62) that generates the select list. You can easily add some code here to display more information about the different profile types, if you want to hard-code it. When we implement something, it will obviously pull from your settings in JomSocial.
Currently, we don't have a timeline as to when this would be implemented. This is in queue of to-do's, but not the highest on it. It won't be in the next week or two, but will be by the end of the year.
Hope that helps, and good luck,
Alex