[USAPatriot]

Nah...this isn't working. I've gone through it forwards and backwards. Making the forum read only, putting a test user into a special user group, giving him mod priveleges (Specifying that he can post) just steps on the read-only aspect. The software seems to see the conflict and takes the safest route. It disallows posting. Other ideas? -Rod-

Set your normal usergroup to only allow reading on the category.

Now set User A as a moderator of forum A.
Set user B as moderator of forum B.

Finished.
(Maybe you must also create a usergroup A and a usergroup B, give those groups posting permissions for forum A or B, and give user A/B the corresponding usergroup A/B as a secondary group.