Sounds like a nice idea. I'm not a huge fan of roller balls, but maybe a D-pad.
Actually it's not (as stated in other threads) the chrome bezel, that's causing the haze. It's the turquise/blue side of the slidder covering the camera.
I use fake's stand (search and ye shall find) and it's excellent.
It would improve sound quality when holding/using the device, but it would take up precious front real estate better used for a larger display.
Capacitive: NO! Whenever I use my wife's Samsung Galaxy i7500 Android capacitive touch screen, I'm appalled by the lack of precision and the fact I have to use my big, fat finger instead of the tip of my nail. Contrary to my initial expectations, I find the touch screen on the N900 to nothing short of excellent. Multi-touch: Yeah, as long as it's resistive.