Scroll Bars Within Window

The lower right windows (where you can see the changes of the selected file):
the horizontal scroll bar(s) are often placed much to low to be visible. Unfortunately the cursor keys are not bound to scrolling here.
It would be much better, to show only one horizontal scroll on the top or bottom of the window!
Instead of having a horz. scroll bar per block of changes, a single scrollbar would simply scroll all blocks with changes within the window.