You cannot use DSCC to perform this task. Use the command line, as described in this procedure.
Edit the default mapping entry or create new mapping entries under cn=DIGEST-MD5,cn=identity mapping,cn=config.
The following command shows how this mapping would be defined:
$ ldapmodify -a -h host1 -p 1389 -D cn=admin,cn=Administrators,cn=config -w -
Enter bind password:
dn: cn=unqualified-username,cn=DIGEST-MD5,cn=identity mapping
cn=config
objectclass: dsIdentityMapping
objectclass: dsPatternMatching
objectclass: nsContainer
objectclass: top
cn: unqualified-username
dsMatching-pattern: \${Principal}
dsMatching-regexp: u:(.*)@(.*)\\.com
dsSearchBaseDN: dc=\$2
dsSearchFilter: (uid=\$1)
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Restart Directory Server for your new mappings to take effect.