[Logician]

I'm perfectly sure Firefly will not need my suggestions but I am experienced in this hack (I coded it a few monts ago but found not good enough and quit the project all together although it's finised) so I want to mention that if you dont create a special table/field in db for these messages, things get complicated real bad.

It's really not a good idea to make some lines hidden/visible for some users in the post because there are many gaps to close in this approach: ie they get exposed in searching, quoting, print thread etc. So I believe the best method is to create a special table or field for these thread-in line pms which was not my strategy in the begining..

Also it's a good idea to make them visible to all Admins/Mods, otherwise they will go unmoderated.. My 2 cents and good luck..