Quote Originally Posted by Kitsume View Post
Swimming strokes change if you switch between run and walk while swimming. Swimming, like running, skill gains seem to decrease your energy usage as you level up the skill.
I see; as quoted above was changed on the feature list. As it now states:
Swimming ability and speed are based on skill, stats, type of armor and clothing worn and encumbrance.

And not:
Different swim strokes are available based on skill.