Store information about who published a document

When a validator publishes a document under workflow, it is not recorded who made that decision.
A possible place to store this information is as the author of the new version that gets created when changing the workflow state to "published". That would be relatively straight forward to implement (I think).

Alternatively one could invent a new class which records information such state-change event (ie., is a triple: (User, State, Date) and stores these on the page as objects. That would be somewhat redundant information but might have the advantage that the Validator (which might not have changed the content at all) is not shown as the last author. This also allow for HQL-Queries about who changed what workflow state.

Is there any interest in this feature? I know some users who would like to see that features ("ISO-9001 compliance") and would be content with the "simple solution".