Windows Phone Thoughts: Scroll Wheel or One Handed Navigation?

"Over on the Windows Mobile Team Blog they have started a discussion about One Handed Navigation... It was very timely as I was about to post a similar article as now we have Push Email lots of customers have been asking me for a scroll wheel like a Blackberry.... Now when you break it down - the scroll wheel isn't the critical item - it's more that people are looking for single handed navigation and the ability to use the device without having to pull the stylus."

I had thought about posting a poll over what everyone here wants - a scroll wheel or one handed navigation, until I realized that the overwhelming answer would probably be "Both"! Seriously, I honestly can't see Windows Mobile progressing any further without one-handed nav built-in, and scroll wheels always seem to be a big hit with consumers. So One-handed is a must, but the scroll may just be a nice novelty - what do you think?