I have been playing with redisdb myself. I haven't found a good GUI (not even one that doesn't need some hammering).
You could try replacing your dump.rdb file, but to what end?
Being able to hack a system is nice, but making that a regular behavior is pointless, after all, that's the reason why we are installing Zentyal in the first place.
As for DHCP, you have quite a number of templates:
/usr/share/ebox/stubs/dhcp/apparmor-dhcpd.profile.mas
/usr/share/ebox/stubs/dhcp/dhcpd.conf.mas
/usr/share/ebox/stubs/dhcp/includes.mas
/usr/share/ebox/stubs/dhcp/shared-network.mas
/usr/share/ebox/stubs/dhcp/staticRoutes.mas
/usr/share/ebox/stubs/dhcp/subnet.mas
And if that's not enough, you still have the Hooks system to manipulate any file in any way you want.
Anyway, good luck and let us know how the things progress.