Thank you for filing this request.
We have logged an internal feature request for adding support to the Animation codec for both encoding and decoding delta frames (a.k.a, the “Key frame every X frames” option). It is currently under review for future updates to the Adobe DVA products. At this time I can not share a timeline for when this might happen.
An error occurred while saving the commentBen Gurney commented
Just got into a chat with tech support. He said that they will bring it back. Somehow I don't believe it.