Looks very nice. I am currently designing a level, so unfortunately I ain't got time for betatesting. I can only make a few suggestions (I downloaded your file, but didn't test it yet, so maybe some comments are obsolete) : Allow onscreen help (simply text all help info to the screen, with the app running in the background as usual), plus 4 windows would be useful, top, front , left etc., so bones could be moved and rotated more intuitively. A Timeline would be nice, that allows to drag and drop keys and groups of keys (lasso, ctrl-lmb etc. to select) Finally, try to use Buttons and Gadgets that can be used with as few clicks as possible, because when you have to click a menu twice just to click a button on a popup alert, that will stop the workflow.