Yesterday I was in situation when some dude tagged us without our permission (we didn't even noticed that little dot upper his head) and brought enemy faction to our assignment. Obviously they killed us with ease (who expect enemy factions on assignments), loot us and run away. We can't chase them on the world map, so that was pure profit action for them. that's why I suggest to add some little window with "XXX will tag you. YES/NO" to avoid similiar problems and of course block possibility to tag enemy faction.