Replacing the standard horizontal scrollbar with one with a waveform view, to make it more helpful with navigation by indicating which part of the file is shown.
On the left side should be a widget allowing to scale it by dragging. An up/down arrow could be used as symbol. If min or max are reached, the corresponding half of the arrow should be shown grayed out. (See attachment)
Per default an overlay of all channels to one wavform should be displayed, but there could be an option to show them all channel wise.
The whole area should be used for dragging the slider (and thereby the view). This way the slider can become as narrow as 1 or 2 pixels, since it hasn't to retain a minimum size as mouse target. The mouse cursor should change to a left/right arrow on hovering over the scrollbar.
Middle clicking could make the slider jump to that position.
Ctrl-click-dragging could used to move an edge of the slider for zoomin, perhaps.
