[Plugin: Facebook Connect] Redirect, no logout, user reg date

Hi, I know that the author does not provide any support to this plugin anymore but big thanks to him. My issues with this plugin are following:

a. Facebook logged in users are redirected to error page (404);
b. Facebook logged in users even when logged out unsuccessfully as above given issue, they still remain logged in the web.
c. When a user registers through FB, they get a user ID and with a number added to their userlogin, mainly number 1.
d. When a user is first registered, it shows right registration time until they post a comment. When a comment is posted, user’s reg time becomes 01/01/70 which is as I know default Mr Word Press login’s registration date.

How do I fix those issues? Any idea?

https://www.ads-software.com/extend/plugins/wp-facebook-connect/