"window settings" window
 

I remember to have seen a screenshot of the "windows settings" window, where you could seen the %'s for the opacity, but I can't seem to find it again. Does anyone remember where I can download this mod, I've search both the forum and the download section, but alas to no avail.

Both Fetish sets include this. If you're using any other Fetish piece, you could download the Classic set and just install the eq2ui_mainhud_windowsettings.xml file ;)