Edit /usr/local/etc/fml/site_default_config.cf file. The format is same as config.cf.
This file corresponds to site_force.ph of fml4.
author's homepage is www.fml.org/home/fukachan/.
Also, visit nuinui's world :) at www.nuinui.net.
For questions about FML, e-mail <fml-bugs@fml.org>.