1. First thing that i want to point out is that "alternative_mod FB Application" require to much data from user, with will scary them out. The only thing it should require is "Username" and "email". Real name and surname, sex, network, and especially friends list and all other information that i share with everyone are not essential for registration.
Personally, i never ever want to register via FB if application require more that it's needed, because it means that all data are collected for commercial purpose.
2. In addition to that, "alternative_mod FB Application" can ask "Do you want to share you IM's" or something like that. It would be easy way to share all/selected IM's.
OpenID login don't work yet, right ?