Yea writing shaders is tough. I tried looking into it before, it's a different beast to C#. :drunk:
I usually check ToddRiver's github, but no significant updates on his side and he hasn't responded to Git comments in months. Which is fair, we shouldn't hassle him over maintaining his shader.
Do you guys have plans to continue updating with some official Unity Spine shaders? I guess with a small team, it's not easy as well.