It occurs to me that opt_hidefriendofs should probably be checked first since it's more inclusive, unless we want to change the two options to be truly separate, like so:

 return 1 if $list =~ /^posting_access/;
 return $u->prop( 'opt_hidememberofs' ) if $list =~ /of_comms$/;
 return 1 if $u->prop( 'opt_hidefriendofs' );
 return 0;