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I was thinking you could cut down the bricks in the toolbox by a third by casting sub-menus off each of the rotating bricks; i.e. each rotating brick would have a little button a la Photoshop, giving access to the other three rotations. This retains a degree of user-friendliness for new initiates to the site. (No mucking about with special keys for rotations.)
If the user's palette floated like the others, that would give more room too. I find the floating palettes quite good because you can drag them out of the way.