[Inkscape-user] aligning to grid

Objects seem to align to the grid 3 ways: to the center line of the object's outline, to the outer edge of the outline, or to the inner edge of the outline. This leaves some wiggle space which can throw off the manual aligning of several objects. Is there any way to turn off 2 of the 3 and get rid of the wiggle space?

Thanks, Wayne Inkscape 0.42