I am now using live-helper's autoconfig with Debian Live SC.
commit 347c832f1bd3c1d54315ab597e7a8e8b6cfc9fd7
Author: Svend Sorensen
Date: Wed Feb 18 12:25:17 2009 -0800
Use autoconfig to build config files
config/binary | 154 ------------------------------------------------------
config/bootstrap | 53 -------------------
config/chroot | 61 ---------------------
config/common | 123 -------------------------------------------
config/source | 9 ---
scripts/config | 7 +++
6 files changed, 7 insertions(+), 400 deletions(-)
7 insertions(+), 400 deletions(-). Nice.
There is a good example of a live-helper config using autoconfig here.