May be this can help you http://wordpress.org/plugins/buddypress-login-redirect/
codegene started the topic Buddypress Login – How to rename wp-login.php to login.php in the forum How-to & Troubleshooting 1 year, 2 months ago
I want to rename wp-login.php to login.php so that whenever someone visits wp-login.php , 404 page not found is returned. I just noticed that buddypress.org uses the same. The login link is http://buddypress.org/login. How can i achieve the same?
@codegene Not recently active