Make the vertical scrollbar wider without affecting the scale

I have been successfully using the consolation on an android phone, but the vertical scrollbar is too thin to get to properly.
One solution is to increase the scale. I think it would be better to have an ability to make the scrollbar wider.

I can see how the standard scrollbar could be hard to select on mobile. I'm fairly certain GUILayout allows us to customize this; should be straightforward.

I added the option to apply a custom GUISkin to the window.

This allows you to customize the scrollbar width (and any other style).