With the bros you can:

• Camp (reload your auto save to fix if your standard moves)
• Drive (needs to enter battle and swap/swap back to get back your moves)
• Shop
• Take quests
• Talk to Cidney (I see you)
• Do most of main scenario quests (careful to save regularly in case it freezes)
• Unlock new recipeeeh
• Fight
• Fight again.

You can't:

• Ride chocobos. Well you might, but you won't be able to leave them.
• Initiate battle with weak/non aggressive monster. It takes more time and sometimes require Noct to actually attack them to start battle
• Ever go back to normal gameplay once you started playing with the bro you like. I warned you, it's addictive.

Known issues:

• Music might not trigger as it should. Sometimes in town you will get field music. Well, you'll get used to it.
• Equipment menu will be a mix of your bro and Noctis. it still works fine.
• Leader does not loads with all his actions/moves. You must first enter battle, swap to another character, and swap back to the leader you chose to fix it.
  *Remember, when you're stuck, load original party, it might fix it. Or get into battle and swap/swap back to get all your move.

Open Flagrum, select Install from Zip and choose this file
https://github.com/Kizari/Flagrum/releases *Version 1.2+ required