On a similar point, I don't trust the remotes on electric garage doors. By nature, they are not generally secondary locked inside, or what is the point of being electric?
When we go away on holiday or the weekend, I have always turned off the electric to the garage door opener as a precaution.
I now have a better solution, a wemo wifi socket.
Now, automatically, the electric is isolated overnight to the garage door opener.
During the day, using IFTTT app that works with wemo, the power is also automatically isolated whenever I leave the geofence area of the house, and when I re-enter the geofence area of the house the wemo switch is turned back on.
If the Mrs needs to open the garage door when I am away, she can override the switch by pressing a button on the front of it.
This might seem a bit OTT, but the wemo switch was less than 40 quid (
http://www.belkin.com/uk/p/P-F7C027/), the wemo app is free to switch it on and off by my phone, and the IFTTT app is also free (
https://ifttt.com/discover)
You can also buy the wemo maker (
http://www.belkin.com/uk/F7C043-/p/P-F7C043/) with this you can operate your garage door using you phone, and get notification when it is open by using a magnetic switch.