Display a close icon (x) when hovering over buttons or on the active button.

I use my taskbar like a web browser's tabs bar, but for apps/windows instead of websites (top position, small buttons, showing badges). So in the Tweaker I find it necessary to disable thumbnails or lists while hovering, or else it often pops up accidentally when I'm selecting browser tabs and gets in the way. This leaves me with right clicking and selecting 'close' as the fastest option to close a window. However, I think the taskbar could be revolutionized as a "windows tabs bar" if only we had a convenient way to close tabs/windows like in browsers. Is this possible? It seems like it could be easy to crop and reposition the "X" button from the thumbnails to the right side of the tab when hovering over.