If you wire the mechanical disconnect closed you can not disconnect the door from the motor in an emergency. That is why the pull cord is red it is an emergency disconnect. Sometimes the electronics fail and a door would come down on a person or property. If you do wire the disconnect closed, move the pull cord to the celling plug where the motor is plugged into the power. Then you can at least stop the motor from continuing to drive the door by pulling the plug. Then if you have to you can cut the tie and release the door from the drive.
There are so many ways to get in. It's impossible to secure everything. I think the biggest problem with powered garage doors are the scanners that a thief can use to activate the door openers.
I personally like devices that sense motion and activate an alarm and turn lights on. That usually is enough to ward off a thief. A thief will generally go to an easier target. The audible alarm can be relatively short lived, just enough time to let you, if your home, or your neighbors know that some one is trying to get in who shouldn't be there.
Another solution is to lock the garage door mechanism. Under the keypad on the wall is a switch that deactivates the operator. Only problem is no one, including you, can open the door with a remote when that switch is turned to off.
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