Editable built-in grid

It would be very helpful if i could edit the built-in grid starting point in the same way I can edit ruler´s starting point.
Sometimes when I am in the middle of the work already and need to set the grid in the back as guides, but I would need to snap the grid to my design and not my design to the grid.
This little feature would be quite helpful I guess. Faster than using a grid tool too.

Cheers. Lukas