Across just about every Windows application except S1, Ctrl+click is used for non-consecutive selection, in S1, Shift does this. In every other Windows application except S1, Shift+clicking selects the items themselves and everything in between the items you just clicked. S1 should modify the shortcuts to conform to other Windows applications (or at least offer it as an option). Ideally, it'd be the same rules as you'd find in something like Excel.
So just to elaborate:
Ctrl+Click = Select non-continuous events, clips, or tracks
Shift+Click = Select all clips, events, or tracks from the first item clicked to the last, with everything in between