Hi there, long term user here...
Here is a feature suggestion from me. I'd like to have an option to view all the files in the library, no matter what folders they are in. Sounds strange, when I bought the plugin for creating the folders? Well, sometimes it happens, that my (or client's) folder structure get so complicated, that I'm just not sure, in which folder the file is (and I don't remember its name). Sometimes I'm so desperate, that I have to deactivate the plugin to see default library with all the files to scroll them through.
So, such a option would be awesome.
Recently, I've come across 2 relatively new (and free, although limited) plugins for "foldering" the media:
Mediamatic and Filebird
Both of them have this option. I've tested them both and I have to admit, that I found them a little bit better arranged and visually more appealing.
For example, your plugin has narrower folder pannel, and deeper levels of folders with longer names just don't get fit there. Yes, I can change the width of the left pannel, but it isn't saved and after reload it's back to default.
Maybe you could get inspired...