So I was going to add a garage door open sensor, but not to my alarm, to my home automation system, just so I know if the garage door is open.
Instead, I have an el cheapo, 720p camera installed by the door from the garage into the house. It captures anybody entering from that door, and also shows if the either of my garage doors are open, and if the cars are there (so I know if my teenage daughter is home lol).
So, if I'm worried, its now easy to check. I used to have problems because the safety sensor on one of the doors would keep the door open when nothing was blocking it, but I recently replaced it, and now door works fine.
Next step will be to add something to my HA system so I can remotely open/close the garage door.
Randy