taskbar height- thickness

Could someone remind me what settings in the .uis file determine the taskbar height / thickness?  In unskinned Windows, I know the taskbar is the same height as the titlebar or caption buttons, so I can adjust the taskbar height temporarily using Windows display properties. 

(The functions "small taskbar size" and "large taskbar size" in the WindowBlinds configuration panel are unsatisfactory -- selecting "large" stretches the quicklaunch buttons vertically, making them tall buttons.)