I now know thanks to Agent_Smith, put this in the config, i assume you know how to config, if you don't just e-mail me, SpeciminX@aol.com and i can write you a config
ladders[]={ {"start","end"},{"start1","end1"} };
you can degfine whatever selection you want as ladder, i don't know if there's a limit, never tried to find out, you try it and post the results, hope this helps, mail me if ya need more help