From experience, the set as faction friend tool doesn't do anything to stop NPC guards from reacting to a player's OCR, which can make it very difficult to do things like arrest a player with high OCR, as all the NPCs will attack and try to kill them, even if the player with high OCR is shackled and being guarded by PC guards. Some kind of tool to temporarily lower a player's OCR or similar would be very helpful for these situations, and lead to smoother roleplay.