I got TrackIR 5 last week, and withough doing any of the tweaking in this thread I already love it. It`s absolutely revolutionized my enjoyment of the game. Beyond any other sim, TrackIR truly lets you _be_ the pilot in this game.
No more padlocking, I just turn my head and keep my eyeballs on target the way real pilots did it, and it feels awesome.
I`ve even had my neck hurt one trying to keep a lookout for an enemy flight while holding formation (good thing I did, spotted a gaggle of 109s as we were being bounced *grin*).
Right now though I can`t do any zooming in or leaning my head out of the cocking with track IR (only the pitch and yaw and roll axes are working), but I imagine doing what the OP prescribes will help. Also the roll axis was reversed and I had to fix that in my profile - if you`ve never had that happen to you before, try it out, sorting out which way to roll my head to straighten out almost broke my brain.
Also, just one question: what is Vector Expansion anyway, and what does it do?
Anyway, I`m having a blast now, everyone who loves this game should get TrackIR. No questions asked.