Enable scrolling in film strip without mouse
At the moment, moving the film strim forward/backward with the mouse wheel works fine. Without a mousewheel (e.g. when you work on a laptop), the navigation is very limited (explicitely select the first/last visible icon to move a few positions forward/backward).
-> Implement the possibility to move with cursor keys or some other possibility to move forward/backward in the film strip without a mouse wheel without explicitly selecting a picture.