[Brian]

Welcome to the forums! OmniFocus supports "Due Soon or Flagged", but we don't have support for the specific combination you're looking for here. Sorry...

However, I'll check our development database and make sure to either attach this to an existing feature request or file it as a new one if this isn't something folks have requested before. That way the rest of the team will know you want this and we'll be able to consider adding it in the future.