setting a slower speed which can cause camera shake and panning-blur, particularly in an IC-powered model. Consider using the sport setting to force higher shutter speeds.
Most cameras time-out to save power if this are no button-presses for a while and sometimes this cannot be extented beyond a certain period. What happens next depends on the camera; some will wake up on a shutter-press, like the Olympus, others require a depression of the power button. Potentially this means two lots of button-pushing gear - frustrating and unwieldy to say the least. A way round this is to ensure that a shutter-push takes place within the time-out period, either manually or via a timer... Much better to chose a camera that does not have this limitation.
Assuming you are going the low-tech route of a servo, how is the servo to be mounted to the camera? A tripod mount can offer a bracket-mounting option that might otherwise need to be engineered. The coupling needs to be secure and reliable.
Of course, if you are taking video then the camera can be set running manually before takeoff and stopped when back on the ground. This is invariably what I have done.
It is well worth exploring the menus to see just what can or can't be configured as the right camera set-up can make your system much easier to operate.