I woulk make a breech of etiquette rule
anything that hinders another golfer because of a golfers breech of etiquette, allows the hindered golfer to place his ball in a simlar lie of the conditions that are around his ball.

for example, if you are in a footprint in the sand, you can remove it from the footprint and place it back in the bunker

as you said, an unrepaired divot, the ball can be placed next to it or on top of a repaired divot

it is unfair that a penaly occurs because of someone else