Feature request: Tiles Offset Mode

[pawelfilip]

I often end up masking out seams manually and I don't mind.

It would be great to have a checkbox for additional half tile offset pass. This would run 2 generations in batch, one normal and one with tiles offset exactly half the size of the tile to offset the tiles on the canvas. Resulting 2 images would then be blended manually by the user in gimp or photoshop.