sysval(resolutionwidth): Change the width of the SMBX window, default value is 800, R&W.
sysval(resolutionheight): Change the height of the SMBX window, default value is 600, R&W.
These would not stretch the GFX of SMBX but it changes the window, so we can have widescreen SMBX or retro FC/SFC like episode. That would be useful, I highly recommend to implement this feature.
I also suggest it can be edited in level settings of event window, as it can bring convince to the newcomers who dont know much of scripts.