There really isn't much use for a tool like this. I mostly made it just to have fun with python and mess around with pygments. One possible use case could be for generating images for a website perhaps? It might be neat to have a minimap of the code of a website as its background.
An editor or IDE could shell out to an arbitrary minimap generator instead of incorporating it inside. Composition of small components, each doing one thing well.
This is a command line tool, not a library. It's not feasible to spawn python process 30+ times per second (during scrolling).
How about once to make a long bitmap image and then the IDE scrolls around in the image?
It would still have to regenerate the image every time you type something.