Drag and Drop translation is supported. Simply drag the desired source resource file onto the application icon (or an Alias to same). A progress bar will show you which files are being processed. Because I do not spend the time pre-counting all files, the progress bar may move backward as more files are encountered. (Specifically, it will move backward each time a new directory is entered.) You may drag several files (or even a folder) at a time, and they will processed one at a time.
NOTE: One limitation is that Drop Shell seems to only go one directory deep! This may be a limit of DropShell, but I haven't bothered to look at it. So, this will work:
