I'm interested in smaller too. I'd get a ptz, but I don't want neighbors actually seeing them get tracked by a camera. I'd even consider a more limited range ptz with auto tracking, something packaged like an HDW5231R-Z turret and with only 30 degs or so of movement. I don't need 360 free spinning, etc. I just want to aim at driveway, but it would be nice if it could move just a little and auto track/zoom in just that area. Of course, I assume, once they've gone through the trouble of adding motors, etc, it would most likely be priced just like any other ptz. Wish the current ptzs somehow looked a little more discreet.
Or maybe they could just use magnets and design a camera that has 5 snap positions, left 30deg,0,right 30deg, and then the same for up/down, and at least now, the camera could decide from 5 different positions to capture the image.