Generally- so far, flua only drives the generation of the various files we derive from syscalls.master.

There's been some WIP to also use it for some pkgbase stuff, as well as an ldconfig lua script for use in post-install scripts now that pkg supports post-install.lua.

I've had my eye on a couple of other components that could use a rewrite with flua. A new flua-based replacement for kernel config(8) could be quite excellent, for instance.