Hey,
I'm not entirely understanding any of these requests I'm afraid, so maybe you could clarify?
I don't understand 'guest login/view'.. If a guest can login, then surely a guest is a member? Also using permissions you can decide if a guest can view a forum or not.
A registration link and member login and logout is already linked to your WP in the sense that SP doesn't have it's own user base, they are WP users, and thus they are logging in and out of your WP site already. You can completely remove the forum login and registration buttons, and instead use one from your WP theme.
If you are looking for a broad range of customisation options regarding this however, you might want to look into membership plugins.
Sorry If this is not helpful, but as I said, maybe you could clarify exactly what you mean by these requests?