It would be amazing if we could use our own scrollbars and change the shape (edgy or round), colour and transparency of it. I think this is an important part of the design and the casual scrollbar (although everybody has something different, which is even worse) doesn't simply look good. Besides that, it pushes the website to the left which makes it look unaesthetic when going from a page without the scrollbar to one with it.
Thanks for the idea. We will review it and hopefully develop it soon.