Hopefully it will be implemented one day. 
Indeed, the simplest solution voip.ms could implement is simply to allow a VM as possible (or final step) in a Call Hunting scenario.
Ring group is a good solution in the meanwhile.
By the way, I just remember that I asked something similar a while ago and someone suggested an approach that I finally did not try because I simply used a Ring Group. But maybe this could work for you. Using a Ring Group inside Call Forwarding could do the trick.
Go check this post:
Kind regards.