A friend of mine, BigKev coded a first-person view system into Rpg Maker XP. That's how flexible it can be. With enough smarts you could even make a battle system much like Final Fantasy Tactics. I'm sure BigKev would be able to handle it - he's a god with the scripting process of games.
But honestly, the things that you guys are asking are more than child's play if you're even slightly competent with the program. The easiest way to change class is to take advantage of the CLASS aspect of Rm2k3. It makes sense.
