Add some toggle switch widget on taskbar, to turn (e.g.) bluetooth on and off

It'd be great if there could be some toggle switch on taskbar to enable/disable Bluetooth (mostly for headsets, connect/disconnect of certain headphone would be awesome too, sorry for being so pushy :-D).

This is my specific need, but I suppose many other switches can be offered, like a little drag-scroller to change brightness, etc...