Of course, you could manually make the same change on your own, but the app is probably a bit more convenient. This workaround may already look familiar because it's the same thing many OEMs and custom ROM developers have been doing for a few years. It works by modifying the WRITE_EXTERNAL_STORAGE permission in platform.xml so that apps with this permission automatically become part of the media_rw group, which has write full access to the entire SD card.
Simply install, tap through a couple of screens, and reboot.
