Keep the categories, scrolling tends to be painful, but names+icons is a good idea for sure.

you could scroll down using the mouse, the little wheel in the middle, the little scroll on the side is there simply to tell you where you are on the list, and you can use it too if you want for some reason.

if that's still painful then you could make the list longer, but if more items are added with time it will not look pretty cool ( a very long list to the bottom of the screen that's why the scrolling system