Roof security is an option provided by my developer when we purchased the house. It is inexpensive and the measure is pretty simple.
When the developer builds the roof top, they'll put additional frames on it so that a normal human body cannot simply go through the gap in between the frames. This can also be done by 3rd party contractor after the house is built, in case your developer doesn't provide this kind of option.
This measure, working together with the motion detector of the home alarm system, should provide some basic protection against roof intrusion.