I really like and enjoy using Hazel - I have one annoyance in the program and that is, it's fast to lose an overviews of what the rules does.
I have a bunch of rules that works on a bunch of subfolders within a project - looking in the prefpane I can't easily figure out what project the rules are connected to (without adding unneeded descriptions to the foldername).
I would love if I could create a collection of rules (nest them in a tree like structure - just one level would be fine) give that collection a name that makes it easier to navigate through many rules applied to several projects.