This is the C++ option definitions code as included in FA 0.11. The first column shows option names that may be used to modify/remove these builtin options.
{"deduplication_mode", deduplication_mode, 0, {"-dup", "--deduplication"}, "global deduplication a-la ZPAQ"},
{"config_env", config_env, 0, {"-envVAR"}, "read default options from environment VAR (default: DEFAULT_VALUE)", true /*for_preparsing*/},
{"config_file", config_file, 0, {"-cfgFILE", "--config=FILE"}, "use configuration FILE (default: DEFAULT_VALUE)", true /*for_preparsing*/},
{"remark", remark, 0, {"-rem...", "--rem..."}, "remark (ignored commentary)"},
{"sort_order", sort_order, 0, {"-dsORDER", "--sort=ORDER"}, "sort files in the order defined by chars 'gerpnsd' ('DEFAULT_VALUE' by default)"},
{"recursive", recursive, 0, {"-r", "--recursive"}, "recursively find files to add (to do: or archives to list/extract)"},
{"answer_yes", answer_yes, 0, {"-y", "--answer-yes", "--yes"}, "answer Yes to all queries"},
{"test", test, 0, {"-t", "--test"}, "test archive after operation"},
{"keep_broken", keep_broken, 0, {"-kb", "--keep-broken", "--keepbroken"}, "keep extracted files that failed the CRC check"},
{"dirs", dirs, 0, {"", "--dirs"}, "add empty dirs to archive"},
{"no_dirs", no_dirs, 0, {"-ed", "--no-dirs", "--nodirs"}, "don't add empty dirs to archive"},
{"no_warnings", no_warnings, 0, {"", "--no-warnings", "--nowarnings"}, "don't print warning messages to console"},
{"no_read", no_read, 0, {"", "--no-read", "--noread"}, "only build list of files to compress"},
{"no_write", no_write, 0, {"", "--no-write", "--nowrite"}, "don't create archive file"},
{"no_data", no_data, 0, {"", "--no-data", "--nodata"}, "don't write compressed data to the archive"},
{"no_dir", no_dir, 0, {"", "--no-dir", "--nodir"}, "don't write archive directory"},
{"no_check", no_check, 0, {"", "--no-check", "--nocheck"}, "don't check SHA-256 hashes of extracted data"},
{"save_sha_hashes", save_sha_hashes, 0, {"", "--save-sha-hashes"}, "store in the archive SHA-256 hashes of the chunks"},
{"profiler", profiler, 0, {"", "--profiler"}, "print internal profiling stats"},
{"print_config", print_config, 0, {"", "--print-config"}, "display built-in definitions of compression methods"},
{"num_threads", num_threads, 0, {"-tNUM", "--threads=NUM", "-mtNUM"}, "worker threads (default: DEFAULT_VALUE)"},
{"io_threads", io_threads, 0, {"-miNUM", "--io-threads=NUM"}, "I/O threads"},
{"cache_size", {cache_size, 'm'}, 0, {"", "--cache=BYTES"}, "size of read-ahead cache"},
{"bufsize", {buffer_size, 'm'}, 0, {"-bBYTES", "--bufsize=BYTES", "-mbBYTES"}, "buffer size"},
{"chunk_size", {chunk_size, 'b'}, 0, {"-cBYTES", "--chunk=BYTES"}, "average chunk size (default: DEFAULT_VALUE)"},
{"min_chunk", {min_chunk, 'b'}, 0, {"", "--min-chunk=BYTES"}, "minimum chunk size (default: DEFAULT_VALUE)"},
{"logfile", logfile, 0, {"", "--logfile=FILENAME"}, "log file"},
{"group_file", group_file, 0, {"", "--groups=FILE"}, "name of groups file (DEFAULT_VALUE by default)"},
{"workdir", workdir, 0, {"-wDIRECTORY", "--workdir=DIRECTORY"}, "DIRECTORY for temporary files"},
{"diskpath", diskpath, 0, {"-dpDIR", "--diskpath=DIR"}, "base DIR on disk"},
{"method", ParseCompressionMethod, 0, {"-mMETHOD", "--method=METHOD"}, "set compression method"},
{"solid", ParseSolidOption, 0, {"-sGROUPING", "--solid=GROUPING"}, "group files into solid blocks"},
{"ratio", ParseRatio, 0, {"", "--ratio=PERCENTS"}, "automatically store blocks with order-0 entropy >PERCENTS% ("+std::to_string(int(ratio))+" by default)"},
{"overwrite", ParseOverwiteMode, 0, {"-oMODE", "--overwrite=MODE"}, "existing files overwrite MODE (+/-/p)"},lua.register_var("cmd", cmd);
lua.register_var("arcname", arcname);
lua.register_var("filenames", filenames);
lua.register_var("compression_groups", compression_groups);
lua.register_var("compression_methods", compression_methods);
lua.register_var("config_env", config_env);
lua.register_var("config_file", config_file);
lua.register_var("deduplication_mode", deduplication_mode);
lua.register_var("num_threads", num_threads);
lua.register_var("io_threads", io_threads);
lua.register_var("num_buffers", num_buffers);
lua.register_var("ratio", ratio);
lua.register_var("cache_size", cache_size);
lua.register_var("buffer_size", buffer_size);
lua.register_var("chunk_size", chunk_size);
lua.register_var("min_chunk", min_chunk);
lua.register_var("prefetch_threads",prefetch_threads);
lua.register_var("prefetch_cache", prefetch_cache);
lua.register_var("logfile", logfile);
lua.register_var("workdir", workdir);
lua.register_var("diskpath", diskpath);
lua.register_var("sort_order", sort_order);
lua.register_var("group_file", group_file);
lua.register_var("recursive", recursive);
lua.register_var("answer_yes", answer_yes);
lua.register_var("overwrite", overwrite);
lua.register_var("test", test);
lua.register_var("keep_broken", keep_broken);
lua.register_var("dirs", dirs);
lua.register_var("no_dirs", no_dirs);
lua.register_var("no_warnings", no_warnings);
lua.register_var("no_read", no_read);
lua.register_var("no_write", no_write);
lua.register_var("no_data", no_data);
lua.register_var("no_dir", no_dir);
lua.register_var("no_check", no_check);
lua.register_var("save_sha_hashes", save_sha_hashes);
lua.register_var("print_config", print_config);
lua.register_var("profiler", profiler);