No combat log. I could add Tab to just toggle back to the last tab you were on. I'll make a note and try to get to it. The Back button issue you describe sounds like a bug. I'll have to look into it. You can right click any square to center the screen on the square you clicked, which is how you can scroll with mouse. If you hold the button down it will continue to scroll, with the speed essentially controlled by how far from the center of the screen you've got the mouse pointed.