Yes you can control it. I asked for that size drop. The bottom of the screen is 24" from the floor. Perhaps it is too low. I'll decide when I start watching movies on it.
There are adjustments inside the motor to control the stop points on each end. I haven't tried to adjust that but I think you can do it by reaching up into the case with a screwdriver. Or, depending on the control system you choose when ordering, there may be other options. I am using the "higher-end" RS232 option (as opposed to IR, RF, or basic RS232) and my automation controller can stop the screen at any point in the travel.
The tensioning system might need to be adjusted if you change the height, in order to remove any waves in the screen material. There's instructions in the install guide.