APP TOOLBAR: Allow specific keyboard shortcuts (such as 'alt-ctrl-del') to be single click access

Frequently we find ourselves needing to use a single keyboard shortcut quickly and going through the additional clicks to get to it can be a problem. Please implement the ability to customize the virtual machine toolbars such that we can put quick single click buttons that activate various key combinations such as 'control-alt-delete' as a single click for the cursor above the VM window and to the left or right of the current keyboard icon: