All the GM hosted events, RR/Olaola/Fitness etc. limit the entry of extra characters from the same device (with same MAC address). I believe it won't be difficult to implement the same system to bossing squads. If bypassing this becomes a bannable offense, it can actually work since no legit player would risk their hard-earned progress for little convenience during bossing. Staff should be able to trace who bypassed it by viewing the entry log of related accounts from a single player.