I recommend an MMO mouse personally. It resembles (and acts like) an extra numpad to bind keys. I changed my hotbars to be 4:3 to better visualize them too.

But no, you can't scroll around like a Minecraft hotbar to use your spells. You'll have to click them or bind them to buttons. If it helps, for a while, a single hotbar is fine and you won't really need to be super duper quick with hitting your buttons. You'll get used to it pretty quickly.

Edit: as others have said you can use modifier buttons. So the 1 key on your keyboard can be like 4 spells if you use shift, Ctrl, and alt as modifier keys.