Yes, a manual handle is included. Manual adjustment can be done by a child age 6 and up. Drill adjustment should be done by an adult that has familiarized themselves with the operation of the Lightning Adjust system.
It must be battery operated 18 - 24 volt. It cannot be a corded drill and it cannot be a hammer / impact drill ... both types would likely damage the Lightning Adjust system. When using your drill it must be set in low gear (1, not 2). High gear will go too fast and could damage the Lightning Adjust system.
Yes, you can swap out the hand crank actuator for the Lightning Adjust actuator. You'll need two wrenches and work on just two bolts. Everything can be done from a standing position in about 10 minutes. Watch a swap out here.