I've been considering a way to avoid confusion between:
- a tde based livecd with systemd;
- a tde based livecd with sysvinit;
- a tde based installer with sysvinit
and finally came to conclusion that regular-sysv prefix
will be common for installers with sysvinit within regular.mk
and p7.mk; this might be not perfect but should be good enough.

Note that while regular-sysv-tde.iso is buildable and installs
just fine at the moment I don't plan to publish Sisyphus based
installer builds as a rule since these require extra knowledge
regarding daily use (starting with http://altlinux.org/changes
and/or https://lists.altlinux.org/mailman/listinfo/sisyphus ML
subscription).

Sisyphus-based rescue image is fine as well as LiveCDs are;
installable LiveCDs (most of regular-*.iso) are actually
risky in case user actually installs *and* updates those
having ignored the red "unstable" status in the branding,
and that's the line I'm not going to cross that often.