Hi there. Thank you for this great frontend to this app. It is very good and polished. =)
I just wanted to suggest you to create a plugin to 7-Zip to be able to do one of the following:
1. Generate an automatic hash number in a separate file after compression (to prevent file edits/falsification)
2. Generate an automatic file (kind of a .CSV list) )with ALL files inside soon to be created compressed file (for the same reason above).
This app is already a great success and it would become even more used and popular if it could be integrated with another great open source project such as 7-Zip.
Just sharing some thoughts on possible improvements.
Cheers from South America