If you want to second the request and have it count for anything, you need to send email to
omnifocus@omnigroup.com, or use Help->Send Feedback in OmniFocus. Otherwise, the only note/vote for the feature in the development database will be Henri's -- no one goes through and counts forum postings when trying to assess interest in a feature while planning development efforts. Posting to the forum is a useful way to drum up more interest in an idea, but the people who are interested need to do as instructed above to have that interest be noted.