The first Wall Worm modifier is now out: SnapVertsToGrid (http://dev.wallworm.com/topic/77/snap_verts_to_grid_modifier.html). This modifier snaps all the vertices to the nearest grid based on the grid snap setting in the modifier.
Version 1.1
*Fixed a bug when applied to some objects (like a node with a Rayfir Brick Modifier).
Version 1.2
* Fixed the 32 button not working.
* Updated all the buttons to force a viewport redraw to display the changes immediately.