Too hard to scroll large list items

With the current implementation of ListView (and GridView?), it's too difficult to
flick between items of lists were the items are very large (1-3 items per page).

Currently the user needs to drag/flick a distance equal to half an item before
the list moves to the next item (with snapMode: "SnapToItem"). Compare this
to the tiny nudge that is required to scroll between the iPhone's pages of
application icons.

Thus, the ListView (and GridView?) needs to detect nudges and use this to
scroll to the next/previous item (and no further).