I don't understand what you mean by "It would also be nice if non-member lists could also include the members of sibling lists". You can already put any @listname in *_these_nonmembers to include the members of listname. Is that what you mean? Or do you mean something else such as accept_these_nonmembers should automatically and implicitly include the members of any regular_include_lists?
I don't understand what you mean by "It would also be nice if non-member lists could also include the members of sibling lists". You can already put any @listname in *_these_nonmembers to include the members of listname. Is that what you mean? Or do you mean something else such as accept_ these_nonmember s should automatically and implicitly include the members of any regular_ include_ lists?