How to change the color of the scroll bar in a scrolling panel?

I too can't believe this still has not been acted on after so many many requests. Is there some specific or technical reason why this can't happen or are these myriad of requests simply being ignored? It would be very useful to be able to manipulate the size and colour of the scroll bar much like we can control the visual aspects of the slider tool! 
Please add my vote to this feature request. thank you.