What's the difference between real dual-touch and fake dual-touch?
The difference between real dual-touch and fake dual-touch has to do with how the screen is built. Real touch screens have an additional layer to allow for additional inputs. There are ways to emulate dual-touch with software. This is helpful in the case of your particular phone. 

This XDA forum page has a list of updates for particular ROMs including 2 stock ROMs which enable fake dual touch.