Если честно - нет времени собирать все ключи.
Вот функция печать подсказки с ключами -посмотрите там описание ключей:
void
CommandLine::printHelp()
{
std::cout << "\n";
std::cout << "Scan Tailor is a post-processing tool for scanned pages." << "\n";
std::cout << "Version: " << VERSION << "\n";
std::cout << "\n";
std::cout << "ScanTailor usage: " << "\n";
std::cout << "\t1) scantailor" << "\n";
std::cout << "\t2) scantailor <project_file>" << "\n";
std::cout << "\t3) scantailor-batch [options] <image, image, ...> <output_directory>" << "\n";
std::cout << "\t4) scantailor-batch [options] <project_file> [output_directory]" << "\n";
std::cout << "\n";
std::cout << "1)" << "\n";
std::cout << "\tstart ScanTailor's GUI interface" << "\n";
std::cout << "2)" << "\n";
std::cout << "\tstart ScanTailor's GUI interface and load project file" << "\n";
std::cout << "3)" << "\n";
std::cout << "\tbatch processing images from command line; no GUI" << "\n";
std::cout << "4)" << "\n";
std::cout << "\tbatch processing project from command line; no GUI" << "\n";
std::cout << "\tif output_directory is specified as last argument, it overwrites the one in project file" << "\n";
std::cout << "\n";
std::cout << "Options:" << "\n";
std::cout << "\t--help, -h" << "\n";
std::cout << "\t--verbose, -v" << "\n";
std::cout << "\t--layout=, -l=<0|1|1.5|2>\t\t-- default: 0" << "\n";
std::cout << "\t--layout-direction=, -ld=<lr|rl>\t-- default: lr" << "\n";
std::cout << "\t--orientation=<left|right|upsidedown|none>\n\t\t\t\t\t\t-- default: none" << "\n";
std::cout << "\t--rotate=<0.0...360.0>\t\t\t-- it also sets deskew to manual mode" << "\n";
std::cout << "\t--deskew=<auto|manual>\t\t\t-- default: auto" << "\n";
std::cout << "\t--content-detection=<cautious|normal|aggressive>\n\t\t\t\t\t\t-- default: normal" << "\n";
std::cout << "\t--content-box=<<left_offset>x<top_offset>:<width>x<height>>" << "\n";
std::cout << "\t\t\t\t\t\t-- if set the content detection is se to manual mode" << "\n";
std::cout << "\t\t\t\t\t\t example: --content-box=100x100:1500x2500" << "\n";
std::cout << "\t--margins=<number>\t\t\t-- sets left, top, right and bottom margins to same number." << "\n";
std::cout << "\t\t--margins-left=<number>" << "\n";
std::cout << "\t\t--margins-right=<number>" << "\n";
std::cout << "\t\t--margins-top=<number>" << "\n";
std::cout << "\t\t--margins-bottom=<number>" << "\n";
std::cout << "\t--alignment=center\t\t-- sets vertical and horizontal alignment to center" << "\n";
std::cout << "\t\t--alignment-vertical=<top|center|bottom>" << "\n";
std::cout << "\t\t--alignment-horizontal=<left|center|right>" << "\n";
std::cout << "\t--dpi=<number>\t\t\t\t-- sets x and y dpi. default: 600" << "\n";
std::cout << "\t\t--dpi-x=<number>" << "\n";
std::cout << "\t\t--dpi-y=<number>" << "\n";
std::cout << "\t--output-dpi=<number>\t\t\t-- sets x and y output dpi. default: 600" << "\n";
std::cout << "\t\t--output-dpi-x=<number>" << "\n";
std::cout << "\t\t--output-dpi-y=<number>" << "\n";
std::cout << "\t--color-mode=<black_and_white|color_grayscale|mixed>\n\t\t\t\t\t\t-- default: black_and_white" << "\n";
std::cout << "\t--white-margins\t\t\t\t-- default: false" << "\n";
std::cout << "\t--normalize-illumination\t\t-- default: false" << "\n";
std::cout << "\t--threshold=<n>\t\t\t\t-- n<0 thinner, n>0 thicker; default: 0" << "\n";
std::cout << "\t--despeckle=<off|cautious|normal|aggressive>\n\t\t\t\t\t\t-- default: normal" << "\n";
std::cout << "\t--dewarping=<off|auto>\t\t\t-- default: off" << "\n";
std::cout << "\t--depth-perception=<1.0...3.0>\t\t-- default: 2.0" << "\n";
std::cout << "\t--start-filter=<1...6>\t\t\t-- default: 4" << "\n";
std::cout << "\t--end-filter=<1...6>\t\t\t-- default: 6" << "\n";
std::cout << "\t--output-project=, -o=<project_name>" << "\n";
std::cout << "\n";
}
(Главное, чтобы было сохранение настроек).