I'd appreciate a way to cycle shapes in the opposite direction.

[Bawxus (notnull)]

Or better yet, to bind each shape to its own key. I often want to flip back and forth between two different shapes, but that's not possible when they only cycle in one direction.

[kokkilokki]

Yep this is a great suggestion. I'd probably go for 1, 2, 3 for box, hexagon, triangle.