Yes. You can program the open on and off durations, and the close on and off durations. This allows you to adjust the curtains to react as quickly and aggressively as you want.
Yes. If you want more than one set of curtains controlled exactly the same, and the combined motors are within the relay ratings, or you are using contactors, then you may control multiple curtains off one SPC-2.
Yes. There is a software manual override that can be accessed through the SPC-2 menu. See Using manual override mode in the user manual for more information. If you require a hardware override, check of the MOB-4.
The control can manually operate the curtains when required. If you are looking for a hardware solution, the MOB-4 allows you to manually open or close the curtains and then set them back to auto without having to go into the control menu.