Hello there, Bob.
I've noticed your question about the objects reacting to certain words. I have created something that might interest you. There is a "chopper" (search for it) which have three hidden objects in it. They are reacting to three keywords, and are used to fly the chopper. those objects are hidden (physicaly), but they are there. Just find the sth and you will find them. (their name is "sth") They are caled differently, because this determines their keyword they will react to. They are working the same way the commands does, but because they are named differently than "command" or "action", they will work only in their location. (so you can't use them anywhere else). This way you can also make your own personal commands, just put them in your inventory.
BTW the command "nav" in the chopper works for parameters 1 to 4, not 1 to 2 (the list wasn't created by me, and it is a bit outdated.)
When i started writing this, i planned to write a short message :P
Xianus.