Hey spanky, just type 'help' at the server promt and you'll see everything.
From what I can guess, the txt file (like sample.txt) you set up is just a list of commands input at a time there. There is actually a command to just parse a text file of commands in the server too. So really you are just running down a list of flags and what not being set. But yeah help will show them all... basically they are all mostly get/set functions or all the things that can mostly be changed at the admin panel.
So the different users are much like most dedicated servers. When you assign the number of players on the server you specify two numbers. The first one is the max number of normal players, the second is max number of private players. Now... I think that it works such that if there is a difference there are reserved slots, so when I say
set_max_players 16 18
I assume that normal people coming in with the regular or no password can fill it to 16, but there is still room for 2 more private players. I would have to look at the help command again to double check... it might be that for what I think it is you say set_max_players 16 2 though I'm not sure...something like that, but that is my guess.
Other then that it looks like the parser for the .txt file can handle blank spaces and # comments no problem, so you can add notes and what not to things...though I did have some problems with the values I was passing in to certain commands and I wasn't 100% sure what all the gold setting values are... if you use the numbers I set then in the DM you start out with 10000 gold. If I changed the 1000 to 500 it was 500 gold.
Overall the server is pretty easy to use. I wish I could add more detailed logging... though there is just a handled into the log file and the server will keep writing, so I can see it would be pretty trivial to write additional stat tools if the logs ever get more detailed then what is output in the chat windows.