Thanks a lot for the answer TJ Ballard,
Yes, I had no problem dilating Delay-nodes with CustomTimeDilation in 4.13.
My current work-around is now this
http://i.imgur.com/WlxSkWE.png
It works fine for most of my stuff. My only issue now is I can not dilate a Delay while it’s running.
Thanks again for telling about the 4.9 change, it cleared things up for me.