Unfortunately, right now, JFBConnect only support JomSocial's built in multi-profile systems. We don't integrate with JSPT, and honestly don't know much about it.
If there's a specific page the user can be be redirected to, so that they can continue the registration process with JSPT, we can help you setup that redirect. Just let us know how we can help. JSPT is on our plate of things to investigate, but after JomSocial integrated a similar system (though I understand it's not as fully featured), it hasn't been requested nearly as often.
Glad we got your previous issue fixed though, and we'll do what we can for this!
Alex