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As a generalization of Close (X) Button in Window Preview and Easy, Beautiful Progress Notification in the Task Bar, it would be useful if software developers could program various objects to display around their thumbnail when you mouse over their icon in the taskbar.

So for instance buttons and displays could go below their thumbnail when you mouse over an icon in the taskbar. As an example a media player could display a progress bar, a play/pause button, and perhaps a next/previous button. Nothing to major or too fancy, just enough for basic interaction. Kget could give you a button to pause/resume all downloads (as a group, not individually) as well as displaying the overall download progress.

Developers could also set text to display at certain key point (perhaps centered on the thumbnail and three corners, with the fourth being the "close" button). So for instance a media player could display the time remaining or elapsed, kget could display the total number of remaining downloads and the bandwidth, etc.

Windows 7 has something similar, although it is much simpler (only providing basic controls it appears, no text or progress):

Yes, I agree for this! Need close button in taskbar thumbnails like Gnome Shell or Unity