Also notice that the screen is at 1x. This is done thanks to Poccil code. I adapted some features from the Pokestarter, mostly the window/bitmap/tilemap resizing. Coordinates get "scaled" (recalculated) too, so making multiple resolutions is easy as hell!
The options are Music volume, Sound volume, Window size, and Window mode (fullscreen, window). Window size leaves the option to play 1x or 2x, as it was in RM2k3. Just a little thing I wanted to add for personal tastes...
EDIT: And, configurations get saved apart from savestates in a file named Config.dat (it saves every time you exit from the config menu). If the file doesn't exists, the game recreates it with default values.
If you mess with it and can't reenter to the game, just erase it. That will be included on the help file (or whatever the name is).