Hi,
Yeah, it was a hard choice, I also would like the root project folder clean. What I do is I always create a folder dedicated to the specific content of my project, and I leave the the rest to this mix of Asset store content and external content.
I don't think hiding custom actions within the PlayMaker folder is good. I actually move the global asset out of the PlayMaker folder and never save any templates inside PlayMaker folder ( which is the default). Then I can safely delete the PlayMaker folder if I have an issue, or when I have to share projects publicly. It actually make sense to spread things to dedicated folders, which is a lot easier to manage on a large scale. But yeah, you end up with a crowded project root...
Bye,
Jean