not to hammer you any more than you already did...
The shoulder has 3-7 joints in it, depending on who you speak to. Like chris said, you cannot diagnose somebody based on what was described in his history, much less without seeing him. And like steve said, giving an exercise regime, without knowing the problem could exasperate it. next, SERIOUSLY?

NSAIDS?

for a few weeks? without knowing what it is? what are you trying to do? kill his liver?
As for your answer thomas, we need more details. If its truly muscular, taping will not help. If it is ligament, taping will help. If it is bony misalignment, bone bruise, etc etc, neither exercise or taping will help.
You're only safe bet with the info we have is ice...