Are you wanting to change these so that they default on install,

that would mean that you would go through
zc_install/sql/mysql.sql

dig carefully cause if you hit the wrong thing it can make a mess

unless you are 1 comfortable with making changes to a database manually, dosnt seem like you are. and 2 doing a MASS amount of sites, I mean more than 2 or 3 a day, yur better off just making htese changes manually once you get the admin setup