Dynafit release values aren't actually DIN-tested, but you can treat them as equivalent. Because these release values are standardised, you can just have a look at the ISO 11088 chart to find out what you should be using; it isn't manufacturer specific.
Table in PDF form:
http://expert.salomon-sports.com/TechExam.pdf
This is a useful calculator (though it has a few bugs):
http://www.eskirent.com/en/regolazione-attacchi.html
For me, (5ft9, 12st, 320mm bsl, 'intermediate') I get an RV of 6 and I used this as the starting value for both MZ (horizontal) and MY (vertical) and then went out and skiied some icy bumps, adjusting upwards until I stopped pre-releasing which ended up being MZ 6.5 or 7 (don't recall which offhand) and MY 7 or 7.5. Be prepared to spend half a day or so getting your bindings dialed in and you'll be fine.
As regards your second question, you can ignore any rotation-specific blurb on that binding and in the manual... I don't know why, but it looks a lot like Dynafit did the absolute bare minimum required to implement the new antirotation system, and that apparently meant not removing old stuff from the molds or documentation.