Yepp, that's the one. It changes the pivot point of the sprite, just offset it to the middle of the sprites x znd y co-ords.
@ tiresius, I noticed our making a marble madness style game. I have a part way project of pretty much the same thing myself, but using Dark Physics, or a version of it anyway. I have it on pause at the minute as I had come to the stage where I needed to rewrite a good chunk of the editor ,due to a total change needed with the objects to get the physics animations working. I thought a break would be best as it was beginning to annoy. Hope your project is more successful! I do plan to return to it myself at some point. For now I'm playing around with a 2D simple project for appup.
http://s6.bitefight.org/c.php?uid=103081