move cursor in timeline using arrow keys
when the cursor is over a timeline, hitting the right arrow key should take me to the next item in that timeline and show the corrsponding screenshot. This would be far more accurate than the current hovering using the mouse, which frankly is giving me shoulder pain at the moment.
I just realized that hitting F11 (Freeze Sccreenshot) gives me access to that type of functionality. I still think it would make sense to make it always available, considering that the arrow keys are not used otherwise.