Thanks for the concise list.
My take on this (the Norwegian study is the one that I hadn't seen) is
1) The French would claim it doesn't matter (their study is the one that you run into most frequently)
2) The Canadians would say that seated is better for lower inclines and stand/sit is equivalent on higher inclines
3) The Norwegians say that they are equivalent up to around 94% of max power (for a 6 min effort) and then stand for higher efforts.
I think that I will do an experiment at some point, just because this whole thing has made me curious. Of course this would be unique to me, but that is good enough for me.
Thanks.
dave