Warn that guild members are inside before entering a dungeon

So you know how when you go into a popular training dungeon like MJ, DD, or SF? If you have a big guild, you’ll most likely see your guildmates in different parties or soloing. This sometimes lead to accidental deaths of non guild members in your party. Why not put a notice in front of every dungeon stating “A Guild member is inside” Also, you could choose whether to meet up with your guildie or not. What do you guys think?!?! Help me stop these unnecessary deaths on PMU!!!

Thats actually a thing?