You can add camera movement to your time-lapses using a kitchen timer, but using a 6-hour hot tub timer works even better. This spring-powered auto shut-off timer from Intermatic http://amzn.com/B000B8WJZU is an easy DIY project to make a long-duration time-lapse panning camera mount for lightweight cameras. Check out this Skylapser video:

Also check out the quick demo video too: