One of the things that I've found the hardest to change about RPG Maker's systems is the "simple" stuff: menus, raw layout, etc. It fights back when you try to reset some of the engine's defaults. I'd really like to improve our UI/UX. Because the default system is well known, I don't think that many users are going to have any problems figuring out how to play, but I'd like to make those important details more fun and functional over time (for future games and for Arena too, if at all possible).
Which JRPG has the best UI in recent years from your experiences? In terms of looks, the most recent Atelier really impressed me. They've not usually been at the forefront for graphics (fun gameplay though). But Resleriana looks great. Gorgeous menus. I want to make awesome menus.