@teotwin
The tab idea is a good one, however i must say that i am not that fond of the multi gadget, there is too much different control options without visual feedback, its easy to forget if function x was a right click or a double click, or whatever combo it might be.
Btw, your windows 'container' floats into the contents of the window, is the idea behind that to remove elements that might not be necessary ?
My tought is that it is adding rather than removing clutter.
The controlling element of the width/height is on the right side but for the refresh/depth its on the left side, it might just be me but i would like to see them consistently on one side.