Flash loves whole pixels like street punks loved hippies - not a lot.

So what can we do when Flash insists it puts all our pixel-perfect image assets on half pixels, rendering their movements wonkier then a drunken unicyclist? 
We could go through every keyframe and round their x and y positions to the nearest whole number in the properties panel, or (as I discovered today) we could just click a single button. This glorious flash extension works on multiple movieclips at once, can round width & height, x & y, or both!