There's no such thing as a
video track-- you can place any element
anywhere. Although the traditional output is one video track and one
stereo audio track, toss doesn't care what you do. For a special
event, you could create several tracks of output video and an
additional "click track" audio output.
Images in bricks, multiple highlights (used-in-edit, selected,
highlighted from a query, visible on monitor, detail in another
view, etc), zoomable UI to adjust parameters right on the bricks,
easy multiple views of the same timeline.