Ok, let me answer myself.
If I get it right, for interoperability you need the dynamic link which is available in the Production Studio. Otherwise it’s better to render in an uncompressed format and then import in Premiere.
For the aspect ratio issue, 9 times out of 10 you are lucky and Premiere does the job for you auromatically. If you’re not, you have to tweak size and/or pixel aspect ratio manually.
Right? Right…
Paris