in the mean time I have found MaddBomers start button to be very useful
http://www.eq2interface.com/download...fo.php?id=4183
You can shrink it vertically and horizontally to just show a single slider for volume (not a button as you request but same effect) and just 4 video setting buttons that are customisable. There is no nightvision button but maybe you could set one of the video settings to do this? Also worth noting the No Ammo patch to turn it back into a normal start button.