As dictated, from Port of Bio to D6 discussion/issue, this issue is for those interested in the Bio to D6 patch submitted there by jerdavis.
Why? In short, because there's a need/request. But briefly to elaborate at least from my perspective:
1 - C_P does not offer the feature/functionality of the "profile takeover" (see issue) though described (at one point) "proven critical", as Bio did/does.
2 - Functionality of using Autonodetitle AND Content_Profile_Registration.module appears at issue (reg. integration sounded critical as well, with many ANT users)
3 - one size does not fit "all".
Set to "needs work" at outset of this discussion as WHEN PATCH APPLIED (not for Bio 5.x-ANY, only port patch) - neither select list nor radio (or assumed checkbox) type widgets for required / registration integrated fields are presented on reg. form @ user/register. The label & help text shows, but allowed values do not.