Now that you have the Local Read only flag working really good. I would be nice if you could allow the SPML commands to be able to work with it also.
ie.:
Perhaps an isModerator tag that allows us to determine if we want the Posting ability for particular messages if the ReadOnly Flag (spml tag) is true (hint -- provide us with a ReadOnly SPML tag also.)
These two additions to SPML would make the web side look and behave a little more like the BBS side and would make life a little easier for sysops/webmasters to control who can and when they can post messages via an internet browser. At least, it would help little old me.