I have a 10" Meade Starfinder on their equitorial drive. I have tried for
years to do astrophotography with the unit with some sucess mostly based on
luck.
So far your correct. There is no on-off switch and there is no way to
disengage the motor drive. You simply ovrtride the clutch that can be adjusted
by taking the motor cover off.
. There are two points that I would make. 1. When properly aligned the
optics IMHO are excellent especially for the price. 2. The motor drive is more
than adequate for keeping the object in view, particularly for group
observations.
good luck with your undertaking.