You don't need to disable the switch in the car for it to work.
Rendering that "flat battery problem" redundant.
Btw: An easier way to do it is not to actually hook it up to the alarm. Instead, hook it up to your central locking. That way, doors lock, mirrors fold. Easy.
I was speaking to Ula last night, he got it hooked up to his alarm. His also doesn't automatically open back up when you turn the key to ACC and the switch is set to fold-out.