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Is your keyboard / workstation set up correctly to minimise strain or whatever on your shoulder? I think an optimally positioned desk, keyboard, chair, screen etc should avoid much (any?) shoulder movement at all. You don't say whether typing exacerbates the shoulder pain or if it's just a background level of pain that's bothering you while writing, though.
Typing doesn't increase the shoulder pain. (As of the latest doctor's visit, he thinks it's actually more of a neck problem.) It's more the general background level of pain that's keeping me from being able to spend any time coming up with plot-stuff I want to write.