Unfortunately matheous there seems to be no leap forward in patio door security. Having attended 100's of burglaries. I have seen countless patio doors lifted of there tracks. I can assure you if someone comes prepared to force an entry .. you will not stop them.
If they are not prepared to enter using their own tools, the first port of call is your garden shed where they will more than likely find a spade.
Armed with a spade you can open almost any door door or window and if you can't open it, you can definitely break the glass and get in that way.
Before anyone say's "What about the noise" ... when you break toughened glass, there is virtually no noise, and most doors have toughened glass
(It's the law these days in the UK).
If I manage to refit the door after the burglary, I would usually fit a pair of these as they stop the door being lifted by hand ... but not by a spade.
http://www.euro-secure.com/PatioDoorLock.asp?gclid=CNOFnJTB9cQCFUITwwod0qoAyA
The easiest way into most houses is through the front door .. sleep tight !