Maybe I'm missing something, but you can do this with usergroups. For the forum in question for the banned group have all permissions as no except for:
Can view forum
Can view threads (by having can view other threads as no this enabled them to only see their own threads)
Can post threads
Can reply to own threads (optional if you want them to able to respond in the thread)
01-13-2014, 04:27 PM
Threaded Mode