If your provider supplies you with xtreme-editor links and you're tired of them being a ridiculous size with 1000s of channels you'll never use, you can now prune them with m3u-builder.
I'm guessing this hasn't really been an issue for a lot of people because I haven't gotten any requests to add this support, but it's there now if you want to use it.
No hommies on the content use this but it is appreciated in then event