chan_dahdi.conf settings changes

Since chan_dahdi.conf settings like gains, etc are set by the /usr/sbin/wancfg_dahdi script where do I make changes so that gains and other settings are maintained? I don’t want to edit the .pl behind /usr/sbin/wancfg_dahdi because that might be changed in future releases. And I don’t want to hand edit chan_dahdi.conf every time something causes the config to run.

Your suggestions?