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I was going to create a new topic but luckily found this post even if it's old it might be closely related enough. 

I've added:

    taskbaritem|ctrl+lclick            12

to restore all windows in a group but a better idea might be bring all grouped windows to front (but not "Always on top") because maybe some windows are already restored (not minimized) but are hidden behind other windows and you want to see all windows at the same time. I would assume the order of overlap of the group windows would be their last view/layering and the specific window (in the taskbar) that was clicked on to be the one that is brought forward the most/highest layer.

Another idea would be to make them "Bring to Front" toggle-able so in my above example I could press Ctrl+Left click any of the windows of a specific group and they would all be brought to the front and then Ctrl+Left click again on any of the windows in the taskbar to minimize them all rather than create separate hotkeys+clicks to do the same task.