Well as for the sitting this 'oversight' could be seen as another sign of male/female equality in Thedas. Women there can sit how they like with their legs spread if they want without tempting rape or other sexual harrassments, assaults or criticisms of showing off their camel toes.
Being given the option for women to sit and act manly isn't what bothers me, because like Siha said, some people will totally love it and I'm all for it.
What I had wished for, on the other hand, is the possibility to chose an attitude and a posture style at the beginning of the game, so that such scenes wouldn't occur in that "manly" way had you wanted a more feminine/noble attitude for your character. I feel like they screwed up my immersion of the game at times because of that. And that goes for females and males, I'm pretty sure not all male!Inquisitor players would like their Inquisitor to open their legs wide open on the throne as if they were the newest stars of "Men taking too much space on the throne train" tumblr.
I'm totally aware that it'd would require a lot of work, and animators would have to work twice as much if not more (depending on how many posture styles they'd intend to insert in the game), hence why I can understand and excuse most of it, but it felt definitely out of my character at times, to walk and sit like she did. Totally not how I would headcanon it, and going against her personality as well.