a better option for sites such as yours would be the ability to divide a site up so if someone registered a login page 1 they would just get the forums assigned to login 1, and likewise for those logging in at option 2.
Of course if the user visited option 2, they would still be logged in and could benefit from those forums as well.
Some forums may well serve both option 1 and option 2
Searching could then be limited to the forums set for option 1 or option 2.
I know such an option would benefit several sites (including mine LOL )
