Yes, I'd like to be able to add more than 1 mid tile horizontally/vertically because my tilesets are much more complex. And I appreciate you taking the time to reply so quickly and also offer to add the feature. I would really appreciate it if it could become a feature request as I'm not very tech-savvy when it comes to code.
Hello! I'm happy to notify you that I added the feature you requested!
I haven't updated the documentation yet, but you can find the post about the new update here, which briefly explains how to get it going. If you have any questions or need help don't hesitate to post it here on itch, or you could also join my discord where I get notifications much sooner, and I can respond faster (if my time allows it).
I hope you can get the most out of the new feature.