As mentioned in the other topic, there are many ways to access existing libraries quickly. I would be interested to know what you are doing that requires frequently creating and deleting libraries. To my knowledge, that’s not common for people to do, so perhaps there’s a better way you could be utilizing EagleFiler, or when I understand better perhaps I can make your workflow easier in a future version.
I don’t recommend having multiple copies of the same files. You can move existing files into EagleFiler and create new files within EagleFiler. Then there will only be one version to keep track of.
EagleFiler does not track changes to folders outside of the library. However, you can move an existing folder into EagleFiler or create a new folder in EagleFiler, and then if you add files to the folder EagleFiler will notice and import them.
You can use the Edit Notes command (Command-Shift-E) to quickly jump to the Notes field in the Info inspector.