I picked this up a couple of days ago because I started my gf on the original, and ended up jonesing for some new Chrono action myself. Came here looking for a solution to the map issue in 2300AD... very unfortunate that I downloaded the patch during that tiny window! I'll leave some feedback since I'm here already. If these are already known, sorry, I can't read the whole thread. I'm using all except for the menu music and autorun patches.
-Magus is at The End of Time from the first time I arrive. He asks to come along, if I say yes, the character select screen opens, but he isn't an option. I assume this isn't supposed to happen?
-Not sure if this is intentional or how much you care about balance, but you can sneak past the minions to the left of the entrance in the Cult of Lavos, where there's a blob guarding a staircase. This blob's script or whatever seemingly makes it impossible to lose to him, so you can just run down and back up the stairs to get him to respawn and grind effectively for quite some time, quickly becoming a small god very early in the game.
-Ioka Village trader dialogue refers to "Stone Fist" instead of "Stone Arm."