As long as I'm reading this correctly, the man page shipped with "nash" omits any mention of at least a couple built-in commands: "findlodev" and "mkblkdevs" (if those commands still exist, that is). Also, a couple options are in the wrong order alphabetically: readlink raidautorun as are: mknod mkdmnod
I just noticed that a nash man page entry for "setuproot" also seems to be missing. Best just to check them all, I guess.
This isn't ever going to get a lot of attention devoted to it; I'll happily apply patches if you've got them, though.