V2 Page Backward Compatibility

I’ll resubmit an old request as an up vote:
-I realize the vision for V2 is to not need custom CSS. There are couple things that won’t be covered in the design studio. It would be nice if you could at least inject custom CSS into the xml if not in the builder itself. It would be a last resort cover all that would allow for the conversion of customizations from V1 pages.
-I would love actions on decks in V2 for conversion from V1.
-I would love the various tabset formats from V1 to convert to V2.

Thanks for your consideration!