1. Escaping quotes on the command line works, e.g., gengetopt --unamed-opts="a \\\"b\\\"", but from within a ggo-file it does not: args "--unamed-opts=\"a b\""

2. Parsing config files with cmdline_parser_config_file() fails with unescaped quotes. Consider following example:

package "test_escape"
version "1.0"
args "--conf-parser"
option "test" t "Test option" string optional

Running test_escape -t "test \"escape\"" with cmdline_parser_file_save("args.txt", ...) will create a file args.txt with test="test "escape"" (quotes are not escaped properly). Parsing that file fails:
test_escape:args.txt:1: malformed string in configuration file