It might be easier to script your A-RPG engine in RPG Maker, actually. The base architecture of the project will be more adapted to an RPG and you can do whatever you want with Ruby. I've even seen passable A-RPGs done exclusively with event programming in RPG Maker.
Enterbrain also released Indie Game Maker, which is designed for platformers, shmups and A-RPGs.
Enterbrain also released Indie Game Maker, which is designed for platformers, shmups and A-RPGs.