I seem to remember a setting called 'snap to pixel' in previous versions of Fireworks... might be mistaken but it was very useful. I actually can't think of a situation where I wouldn't want this to happen. I spend a lot of time nudging points in tiny amounts to stop unwanted anti-aliasing in my objects.
If I draw a couple of squares and then resize them both at once, they will get anti-aliased edges. Mathematically I can understand why this is happening but I don't want it. I want object bounds to snap to pixels.
There is no "snap to pixel" feature in FW as yet. Perhaps this was a
third party extension?
You can however, manually adjust paths using the paths panel, where
you can round points to full pixels or half pixels.
Other options include snapping to guides or snapping to grid lines.