ok, i have been working with another live creation tool recently.
i have been working with systemd and bugfixing lots of issues in sid.. trying to have my next release running much lighter on back-ends yet including more useful applications, like libreoffice. now using xz compression.
one valuable point of interest is a change to remastersys dependencies is very much needed!
instead of using live-config-sysvinit as a dependency it should be written like "live-config-sysvinit | live-config-backend"
live-config-backend is a virtual package pointing to live-config-upstart and live-config-systemd (or any new ones made in the future).
sysvinit may be current default in debian stable, but it is not the only option. debian is the universal operating system after all, isnt it?

also, i like remastersys as a tool. some updates need to be made that should not be too hard to do.
the dependency change as i said already
also, compression options. this is easy, just set a variable for mksquashfs to point to a value listed in config file. or build the option into the tool itself so it asks.