The touchpad on my old zd7000 was off-center too, and it had the extended keyboard. My only fear is if that touchpad isn't recessed, your (or maybe just my) palm brushes it, and kicks the cursor across the screen. That was definitely one of those things I didn't like about the zd7000.
I dig the extended keyboard though. I don't know why ... I never used it. But it was nice when it was needed. I'd go for another one, if I was in the market.