A very small non-general-purpose scripting language, similar to execline but with slightly less funky syntax (and without the variable interpolation thing as part of the syntax -- that's what I want to avoid). The intention would be that I'd be able to reproduce the batvise tools in a single process each, producing a safe, efficient daemontools equivalent written in a high-level language.
Looking back at this idea, there doesn't seem much compelling reason not to write something like freedt in Python. However, it'd be useful to have a single-executable subset of Python that could be used in limited environments.