Option to identify Resolution

I have had numerous request to have the Resolve status set a marker
each time it is invoked for a ticket so that one could report only the
resolution of a ticket.

I understand that the last comment/correspondence may be this most of
the time however we have tickets where the last comment/correspondence
is Thank You even though we tell them not to do that.

We also have a desire to use the Resolved communications as a basis for
developing a knowledge base.

Is there currently, or planned for the future, a flag associated with a
correspondence indicating if the status is resolved?

Thanks in advance