Thank you for the reply. I've find another thing that, in my opinion, i think would be better to change. It's the name of the folder that entropy create when i extract files from a multiple part archive. When i extract for example "xxx.part1.rar" entropy creates a folder named "xxx.part1" and i think that would be better it creates a folder named only "xxx" without the indication of the part that i've used to extract the entire multi-part archive.
If you don't want to remove completely this thing i think that you can implement an option to chose what method it's better for each.

Other minor thing is the inclusion of extraction percentage.

It's only because i use large size files, so i like to see at what point is the extraction/compression with a numerical indication in addition at the bar, because for me is more intuitive.