I'm not sure if it is related to the position fix, but I have been having issue with the volume control.I am using march 27th 23551 lite edition. The size of the volume is bigger than my screen. Also, while trying to change my wallpaper, if I select animated wallpaper and then albums I'm not able to choose from internal storage. It would seem that it is cut off from the screen. In addtion I don't think toggle1x works with 6.5 roms. I can't seem to get it work correctly. After a little editing I can get it to change from 1x to evdo ,but not from evdo to 1x.Other than those issues the rom is working great. I love how you added the xtask to the bottom right of the screen. Regarding your 3d icons I think it is going to be great. I can wait for it. Are you still going to think about do a black version of GTX?
By the way here is a theme from tacchan23 at xda that I found interesting. Would seem to go well with your black themes.
http://forum.xda-developers.com/showthread.php?t=624874
Here some transparent sliders I found.
http://forum.xda-developers.com/show...sparent+slider