I seem to have had this working, and some of the users DO work. If I add anew user to the eDirectory, and LUM enable them, I cant log in via FTP. if I grep /var/log/messages for pure-ftpd I get this.

Apr 12 08:48:36 HAL2000 pure-ftpd: (?@ [INFO] Timeout
Apr 12 08:49:01 HAL2000 pure-ftpd: (?@ [INFO] New connection from
Apr 12 08:49:10 HAL2000 pure-ftpd: pam_ldap_init: Setting eDir Sementics control failed. error = -1
Apr 12 08:49:15 HAL2000 pure-ftpd: (?@ [WARNING] Authentication failed for user [ftptest]

Any suggestions? I am so close to getting this sorted out, but most of my hair is now gone...