> Can somebody please tell me what is the subscription option "Repro",
 
REPRO means that senders will get a copy of their posted message just as
everyone else on the list does; NOREPRO means you won't get a copy of
messages that you post.
 
> and what are the valid values for the keyword "Default-Option"?
 
The same as all the possible otions for the SET command (see REFCARD).
 
> I seem to be able to obtain  only the  File: "LISTKEYW MEMO" for
> release 1.5d. Where can one find the documentation for
> 1.8a?
 
As I recall, it hasn't been written yet.  You've got the latest of what is
publicly available.
 
-- Roger Burns   [log in to unmask]