If you set your HUD layer scale rate to 0, and use the anchor object it should stay in place while the camera navigates the layout. As far as scaling the sizes of everything on your HUD I haven't figured out a way to do that other than manually resizing the HUD items. But if anyone knows how please let us know.
Also I would like to add on to your question since I was about to make a similar post.
I was wondering if it is possible to get a non scrolling game to fill, and scale every browser sized window completely without boarder lines on the sides or top, and bottom like the games you see on the Chrome web store?
What I mean is in full screen mode it seems to work but only after hitting the F11 button, and that is only if you get the screen size close to your own but in the browser window it self the ratio always seems to be off leaving boarders usually on the sides.
Maybe I'm just going about it all wrong again but Iv been trying to figure it out for days now. <img src="smileys/smiley5.gif" border="0" align="middle" />