related to this

ha, didn't know themes affected that.. This can be closed then.

It should be at least an option then, just hiding them all together is too restrictive

+1 definitely have a look at how Productivity Power Tools 'Enhanced Scrollbar' for Visual Studio does it. Once you've used that you cannot go back. Also for highlighting what's under the cursor etc, and showing the preview is also a huge timesaver. Some screenshots here: http://www.ariankulp.com/productivity-power-tools---enhanced-scroll-bar