I am using PhoneGap 2.2.0 in combination with jQuery Mobile 1.2.0 for my app on the Android platform (version 2.3.3 and up). On the pages I use fixed headers, and no transit
The third link in your post is how I fixed it a while back when I had this problem. I also added -webkit-perspective:1000; The flickering is because of 3D acceleration and the backface of the page being transformed becomes visible for a fraction of a second making it look like a flicker.
Edit: Look at this as well for more info.