The genderized female animation used for live action did not have a counterpart in the cutscenes, which I believe is the basis of your initial complaint.
Gender neutral animations would look equally appropriate on male or female characters. It would be a lot cheaper and easier to do them across the board, which is why I champion it as a solution. (well, that and the fact that I would prefer them to the current female animation).
I think one for each gender is better. As I said, I do not see a woman in a ball gown sitting the same way as a football player in a locker room. In addition people sit and walk different ways.
Jospehine is an ambassador, people will judge her and by extension the inquisition based on her looks and poise. Given her experience it should be subconcsious at the point. I cannot see a female ambassador of any country walking in the room wearing a dress and then slouch down in a chair wiht her legs apart. She would be an embarassment to herself and her country.
On the other hand sera was born and raised in the streets, so this is exactly what I would expect from her. If she were to enter a room in a dress and sit down with her legs corssed and hands on her knees I would be thinking that there is something wrong here.
Personally I think they should put the resources into making it feel more natural for every character, inlcuding the inquisitor.