Hmm... I'm guessing use of the <MIM command? That could cause some errors with the TSC parser, because it can only run one command at a time, but I like the idea. Good job! I'm guessing that there could be a way to do this with ASM, having a tile type that could project light on the character. It would be bad to use an entity because you may want different sprites for lights. It looks like there's space for different tile types based on the tile type changer in CE, but I'm likely wrong.
Edit: Dang it Aar... Ya beat me to it.