Create archives with custom file extensions

It would be very useful if one could set custom file extensions when creating archives with BetterZip. More specifically, I'm thinking about CBZ, CBR, and CB7.

Currently BetterZip forces me to append the proper extension which means I always have to manually rename the files afterwards.

I would imagine this working the same way as in TextEdit's save dialog. There you can check the option "If no extension is provided, use ".txt"". So BetterZip could just use the default extension for the selected archive type unless the user provides a custom one.

Speaking of which, you might want to add cb7 (that's a comic book archive based on 7-Zip) to the "Files Types" pane. While these are not as widespread as cbz and cbr they are definitely gaining popularity and are supported by many comic book apps such as Simple Comic.