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Nick, thanks for your answer.
What you and some other guys said is possible, but not ideal.
What is your longest lens you tried this with?
With my Sigma 120-300 2.8 OS and the 2x is very uncomfortable and risky, and I am not a small guy.
I like the new system, too, what I don't like is the positioning, but I also want versatility from a 3000$ camera.
Also there is no difference at all between this system and the one on the D300 when assigning a function button to the AF-Area Mode...they are exactly the same, just different positioning (better in D300 in my opinion).