Hello.
I also missing The Dude Server. I bought two 5009 devices with the thought that I would put The Dude server there, but it turned out not possible because:
1. It does not go downgrade to 6.x
2. There is no The Dude server for 7.x
I am in a spot because the main intention to buy 5009 was to put there The Dude Server.
pfff yes for now just get yourself a cloud vm and install 6.latest...
unfortunately it is not ready... I hope that we will get something or some information soon