Well I was geeking out tonight with Assessment Treatment of Imbalance: The Janda Approach by Page, Frank, and Lardner. If you’re interested, they talk about shoulders and laxity, pages 206-207. They recommend treatment similar to treating shoulder impingement on page 199-206. You can get a PDF copy for $4.99 off Scribd.com. That will give a sense for how some PTs will treat it.