Hmm... good point on the adjacency issued. though I only have to be adjacent to my ally in order to assist him with the feat. Would Aldori Dueling Mastery allow me to use Swordmaster’s Flair Blue Scarf to alleviate the issue somewhat? Don't think so, but might be wrong about this one.
As for the Harrying Partners - I don't think I agree with this one. The benefit from the teamwork feat is that the benefit of your aid another action last longer, but I can see how this is open to discussion. Ring of Tactical Precision can solve that issue if my DM feels the same.
As for the prestige class... not much, but it carries a nice flavor and I am taking the prerequisites anyway for +1 to all saves, a feat and +2 to intimidate is roughly comparable to 2 more fighter levels.