Hi Tony,I think that a toolbar would have a lot of the same problems, i.e. you'd have to move the mouse all the way to the toolbar, click, move, scroll, click and then move all the way back. This is almost exactly the same as what you have to do today.
A better solution would be to add the Tools | View sub-menu to the context-sensitive popup menu that is displayed when you rightclick. Doing it this way you could rightclick and select View | [LayerName]. The advantage is that it would be one rightclick and one left click, and you would hardly have to move the mouse at all.
We'll add this functionality in due course, but let me know if you see any drawbacks.