1. NOT legal, 2k3 is pirated if you didn't know
2. You can end the game however you want, you could go for a game over, show a picture that says "THE END", or just let the player wander around until they get bored. It's all in how you plan it.
3. I'll assume you're talking about the gamedisk problem, 2k3 is pirated and translated from Japanese, for some odd reason the question marks happen, if you want to test out your game there's an in-game feature that allows you do do so, press the yellow arrow at the top or F9.
4. You'll need the database for this, go to system and you can change all kinds of things from there =O I'd head to System BGM.
5. I'm not sure what you're talking about here, but the bulk of these should be folders(containing images for your game) and maps(those blank-looking things, they end in .imu i believe.) To select your game from there, choose RPG_RT, it should be near the bottom.
I know you might be a little confused, but this is what i have.
also, to the other question, You could use pan screen on a single map, but this could get very confusing. If i find an answer to that i'll tell you, but for now i'm clueless .-.