Extrude Faces Offset Snap I'm back with another super basic question.

I have four faces that I want to extrude inward(or outward) ten grid units. So I have done the following...



I want to snap the faces in or out and have them snap to each grid line, but no matter what options I check, the extrude won't line up with the grid.



These two pictures are snapped to -.9 and -1, but they don't line up with the grid
Set the pivot to "active element" and the transform orientation to "normal" 
Select all four faces in Edit Mode. 
Once they are selected, hit Alt+E and select "region (vertex normals)" 
While the tool is active, hold Shift (to move in smaller increments) and Alt (to turn on even thickness), now it's possible to offset the faces in a predictable way 


It moves two units each step instead of just one, but it's a workable solution. Also adjust the extrude settings to offset by just one unit: