Your post is unclear - -
Have you or have you not tried Kindle Explorer?
Did it work on your device?
What features of it does it have that you want?
What features that you want does it lack?
Please give complete and specific answers to all four questions.
From the context of your more recent post - -
It reads as if you want something that deletes the Sets of files that are associated with each "book" placed on the device.
Not even the Kindle firmware does that. It leaves behind the index, annotations, bookmarks, etc when you "delete" the "book".
Collections Manager, an alternate gui on the Kindle's own collections management, is limited to doing what the underlying Kindle firmware can do.
So, no, I don't expect that "just add a delete group" button to CM is easy, or even possible. Although the author, ixtab may know a way to make that happen.
Now other "file manager" types of add-in programs are things that are self-contained, not limited to what the Kindle's Java code can do. Which makes it much more likely that their feature set(s) can be changed by someone here.
After trying Kindle Explorer - - give the Kindle port of MidNight Commander a try.
Provide details of exactly what would have to be changed in MC to meet your needs (similar to what I just asked you to provide about KE).
Your asking for something that will probably require a significant amount of time and effort on someone's part -
So give us a very well defined problem set to be solved in your reports.