I wouldn't use it on a window or garage door. The glass is not very thick, so it would break easily and would not insulate very well.
NO, NOT 1" is 1/10 Inch, Point & # Incorrect = 0.0937 = 3/32nd inch
Please call your local The Home Depot millwork department. They should be able to help you find the glass you are looking for.
Wow, long over due answer. If your still in the market for this product, the answer is yes, you can cut it to any size you need. I strongly suggest finding a good YouTube video that shows how easy it is to cut and make sure you get a good glass-cutting tool and an emery cloth to smooth out the edges.
NO, Actually no glass should be heated, or worked on with sharp tools or heavy weights applied.
Not a good choice.
Yes this could be used for a picture frame if those are the dimensions the picture frame allows.