It's been a long time coming, Mac users, but it's finally here!
Rather than work out how to fix the fundamentally broken Java 3D OrbitBehavior object, I threw it away and wrote my own. Mac users can now rotate and scale their 3D structure views the same as Linux and Windows users!
Don't fret though, Linux and Windows users, this release is for you too! You can still use the keyboard controls if you want, but you now have the far simpler and more intuitive click-and-drag mouse controls too. If you wish to rotate your design, simply left-click and drag the mouse left or right. If you wish to tilt your design, left-click and drag the mouse up or down. Of course, you can also combine rotation and tilt in one smooth mouse movement :)
Release 0.99.6 has now shipped, and it's a fundamentally different application now (even if it looks similar.) Here are the big changes:
The 'stairs' model is now available on the Freeform tab. Simply select which kind of stair you want to use, and click on the design grid. You'll see that the stair tile has a red arrow on it pointing in the direction that the stairs ascend. To change the direction of the stairs, either click on the stair tile with the stair texture still selected (this will rotate the arrow 90 degrees clockwise) or right-click on the stair tile and select the orientation from the new 'Orientation' menu. Note that when placing stairs the application will remember the last stair orientation you used, so it's nice and easy to place long lines of stairs all facing in the same direction.
Here's an example of a design using the new stairs blocks: