I noticed in 1.8 that the First Name and Last Name fields are now mapped to the wp_usermeta table rather than having to store them in the fields column of the wp_wpforo_profiles table.
I love this! It's so much easier to retrieve the data from wp_usermeta rather than wp_wpforo_profiles.fields using MYSQL.
Is there any chance that you're considering storing all custom fields in the wp_usermeta table in the future?