Kaepernick was changed to have Tebow's style in one of the latest updates.
You could do what I do, which is go to Youtube & look for videos of the QB you want to find a style for. Watch the video, look for hand placement prior to the snap when in the shotgun formation, watch the footwork & trhownig motion, then go through each throwing motion on Madden until you find one that closely resembles the actual style of QB you are looking for edit.
Osweiler has an upright stance. The closest I could find for him is Matt Ryan.
Chandler Harnish: Jake Delhomme.
Matt Schaub: Kurt Warner