I've finally implemented all the changes and additions I wanted, and ThimbleMonkey now supports all the most important files (except ReMI .yack and .dinky parsing isn't complete yet). ThimbleMonkey feels complete enough now to declare this new release version 1.0.0!
This release has more save options (current tab, open tabs, filtered files, all files), it shows a progress bar while saving, and it supports drag-and-dropping folders to load. It also has bugfixes for loading some file types, and it fixes a possible freeze when loading certain images.
I still have some ideas for things to add, but I feel ThimbleMonkey's file extracting features are complete now. Feelin' pretty proud of this project