You can inhibit that behavior by setting the SDL_SINGLEDISPLAY environment variable:
Code: Select all
SDL_SINGLEDISPLAY=1 ./path/to/Armagetron\ Advanced.app/Contents/MacOS/Armagetron\ Advanced
Code: Select all
SDL_SINGLEDISPLAY=1 ./path/to/Armagetron\ Advanced.app/Contents/MacOS/Armagetron\ Advanced