For example, holding alt while slicing a note/event would repeat the slices to the end (I know there is slice to grid, but this way is more flexible).
Furthermore, a second modifier could be used to change the "curve" of the repeats exponentially by dragging left or right. This is a little difficult to explain, but basically Bitwig's "note operators" do something like this and it's amazing for creating interesting and organic sounding rhythms.