I love what astern said and I will be trying it all day for sure
I came across a position by accident when I was walking home from school>
I have to wear a backpack- there is no way around it since my TOS symptoms are nicer to me than my tendonitis in my hands and forearms AND I live in hilly San Francisco, a rolling backpack is out. So the other day was a particularly bad arm day and I turned my backpack around so I was wearing it on my front and tucked my arms across my belly so that the straps were supporting my arms. Which got me to thinking- - some sort of a sling would be good for times at home in front of the TV... the question is where to you sling it from?
Sorry- that was a ramble! Something to think about though :P