Yeah, but it undercuts his character. He was a very smart guy--a genius, even--but in certain situations (romance, action) he is completely awkward and incompetent. While it is a cool moment in the movie to see Simon confidently impersonate an Alliance doctor, precisely drop the stun grenade, and confidently break River out, it doesn't line up with the television series. Not the television series I ever saw, anyway.
You can try to rationalize it away, but it's always going to be one of those gaps between the series and the movie that doesn't make sense.