Yes, such a feature would be helpful, but to eliminate some other problems with the pixel grid, one would also need a feature that alters stroke width to full pixels and some global rules in which directions the changes will be made (expand the object, shrink the object etc.).
Bruno Herfst tried to do something in that area with his JavaScript "AlignToGrid.jsx":
http://toolbox.brunoherfst.com/
Uwe
