I've seen that but either I'm an idiot or that is a CLI tool. What makes Sonarr nice is that it's config is all done through a web browser meaning you don't need to edit config files anytime you want to change something.
Thank you for sharing though I may try and get it set up one day
I've actually checked that out and it's well made but way more than just a subscription tool, it's more for downloading/preserving entire channels.