John and I had discussed the idea that you could pin any one thing you
like to the bottom corner. The mechanics of how you would do that are
tricky; for example, dragging something into that slot to displace
what's there sounds nice, till you think about 'dragging to the Trash' :)
As a starting point, we could allow an 'Unlatch from the corner'
quicklist item, and then a mechanism to drag something into that slot if
it is unoccupied. But it would require a lot of refinement and testing.
Nevertheless, this would let you choose *what* goes into the corner slot.
Prototypes in PPA form welcome :)