1 - I would like to add that the mounting thread is 1/4 - 20 the same thread as a standard camera tripod. I have some all metal infrared cams mounted on mine but never checked the weight of them. I know there way less then 1.5 lbs though. You may need to experiment a bit with the weight thing. If the camera's weight doesn't hang over to far and its not top heavy the Ninja may move it. (has plastic gears as far as I know)
2 - When you purchase the Ninja it should come with a controller. (CR14A) That will send the RF needed to Pan-n-Tilt the unit.
3 - The Ninja comes with a hard wired 76 inch cable attached with a 1/8 inch female stereo type plug. The power pack is a 2-pin AC plug type with a rated output of 12VDC at 200MA. The output lead measures 78 inches long with a male 1/8 inch stereo type plug.
4 - All of mine pan smooth and at the same rate. No jerking at all. Speed is not adjustable.
5 - Mine all start and stop without any jerking.
6 - See above posts.
So far all of them have been able to handle the heat and the cold of summer and winter.