In insert mode, Trim acts as a nice clip previewer for locating shots especially in conjunction with a file manager and drag and drop!
When you start Kino with no project or clip and go into Trim, the Mode is Insert because there is nothing to overwrite! From there, you can load a clip and set in and out points. Click After to make the Storyboard current scene "travel" with your newly inserted scene. Therefore, by repeatedly using After , one can quickly and simply assemble a project.