Am I missing something? I'm running LogJam 4.5.1 and I can't find any way to set a post for screened comments. I could swear I've done it before.
Update: I just updated to 4.5.3 and poked through the code, and as far as I can see, there is no support for prop_opt_screening at all. How did this get omitted for so long? I'll take a look at adding it later.