It was only a "movie". Bernard Hill portrays the Captain Smith as an "actor" with the intent of entertainment only, not a accurate depiction of history to be scrutinized or analyzed. I hardly see how that actor's body lanuage can tell you intent at all!

I suggest if you really want to analye the Captain's actions you might find actual testimony very useful. You might find answers to many other questions by checking out both the U.S. Senate and the British House Inquiry Boards held in May of 1912 here:
http://www.titanicinquiry.org/index.html

There are numerous references there to actual testimony of witnesses of Capt. Smith at the time of Titanic going down that can be accurately.

I would be interested what you find that might support your post that
"that he wanted to sink the ship. Like he knew this would happen and that it was part of the plan all along"

Do you suggest that Capt Smith had any intent to cause harm to anyone for the consequences of purposely "planning" the Titanic to sink? I think that the relatives of the Smith family might find your assertions on the "offensive" or at least irresponsible side.