Hi 
I contributed a lot to pdm scripts handling, made a lot of benchmarking and trials on this topic for the past years (lots of unpublished experiment).
I tried something years ago there, but I never answered back with the result of what I did (basically I had entrypoint based task system working custom branches most common tools) as it was not conclusive.
I wanted to start a new conversation, but I found this thread.
Furthermore, I tried to compare and draft an idea of what could be a base for a standard pyproject.toml task management system. This is something I wanted to share and debate on, so I share it there instead of starting another thread.
There are probably plenty of debatable things, most likely typos, as this also a condensate of multiple notes I have.
I would love to have some feedback on this and take part to this discussion too.