Enhanced usability

I've tested Betterzip now, it's a good app, but I think it needs some batch functionality, for example if I encode & encrypt 20 different single files into 20 single archives with the same password for all, then it would be more than good if I had to type the password only once for all files and run the batch.

The same goes for extracting. Type the password once and remember it for all, - or else, if a different password is needed, BetterZip just should ask while the batch runs.

A single list window ("progress") for all extraction tasks in a row would also be much better, it would avoid cluttering.

Other than that, a very good app.