Photoshop :: Increasing Width And Color Of Slider

I want to center images at higher magnifications. Just because you can put your cursor on the IMAGE and use the scroll wheel to make it go up and down doesn't mean you can make the image go right and left at the same time. Personally, I'd like to continue to use the scroll wheel to zoom in and out (done in preferences, yes) and put the cursor on either the vertical and horizontal slider bars and use the wheel to move the image up or down or right or left. But if you've ever tried to place your cursor on these narrow-*** slider bars you know it's hell to hit those things very
easily because they are barely 1/4" wide--if that.

So the question remains: How can a user increase the width
of these narrow little bars? Is there a way to do this?

Also the color of the bars is very near the same color and value as the
area surrounding it, making it difficult to see. Is it possible to alter the
color of the bars to something more visible, like say, a brighter color and/or different value