When you are in the Camera, push the settings button. It looks like a gear. Then you can adjust both the image quality and resolution. Just bring them down to the lowest level you are happy with and the file sizes will stay lower.
I too was disappointed with the lack of an oem or device-specific aftermarket product. I went with the Clingo universal dash mount. So far, so good. I got mine from Walmart.com, so I could easily return it if it didn't work out. I think you can get it for a few bucks cheaper from an Amazon.com...
Same issue on both my MBP 3,1 and my HP Pavilion dv6. I've paired them with the phone, but they won't connect, so I can share files. I couldn't find any help on Motorola's site, here or anywhere else. Any ideas would be appreciated.