Downloaded a fresh copy of this to play with, to see if I could find the differenced between it and Kebs current release, and there are a few missing commands.
There's also a few directories missing, log, hotboot, src/o, player/b through player/z.
There's also a few problems in the prototype ships in the ships directory. Any that have programs in them, have extra lines in the code, and when tested on my system, resulted in the progs loading into ordered ships wrong. Also there are a few that are in the directory that aren't in the prototype.lst
I'll post more as I find them.
Edit: Turns out the commands weren't missing, I'd just accidentally changed the level in commands.dat