In russian translation team We have found, that it's very useful to use sed utility for batch processing lang pack files. Such processes can be: replacing "Ё" letter to "Е", changing "" quotes to pretty « », replacing two spaces with one, deleting trailing spaces and etc. But amos allows uploading of just single processed file at once.
It would be very nice if amos can take many files at once when importing. As most simple variant i see ability to upload ZIP file, containing all files.
And finally this has been done. See MDLSITE-1539 for details. Shortly, the import form now accepts one PHP or one ZIP file. All PHP files found in the root of the ZIP file (no folders are supported) are processed in once.
Hope this helps.