[emvac1]

For anyone interested in the state of the matter...
This is the reply I had from the support team!
" [...] it looks like we've still got a feature request open on adding a duplicate function. I can't make any specific promises, but I added your vote to help bump up the priority. One of the factors that determines what we add to OmniFocus is the number of people that are requesting a given change, so thanks for requesting this! "

I replied that l would make a bit of advertisement...