[M]

I force the WP registration on my users since the Role Manager WP plugin we use causes the bbPress registration to mark new members as an Admin. I customized the wp-login.php page and included text stating that registration was for both our site and forums.

Just add your WP registration link in place of the bbPress one in login-form.php. If you don’t use a customized theme, I’d stick it in your my-templates folder so it doesn’t get lost when you update.