I unlocked it by doing the same hex editing procedures found earlier in this topic. There are two places that it is mentioned. One is where the game defines its parent menu names. Another is where it defines the content of each menu. Once these both prove to be unlocked, you're good to go. So far, what I've seen here has been dealing with the latter, but we'll be dealing with the former.
First, I'll give you a screenshot, but before I do, I have to explain something. I went ahead when I was testing this and added another menu with my name on it just to see if I understood how the menu system works. Since I'm too lazy to take it out of this, you'll see it in the screenshot. Nevertheless, the Edit menu remains as is.

Now to achieve the Edit menu, look for the section in Cgold.pff that has this:
~BAR6
|X:0<|g Edit ~BAR5
<
>BAR1
Overwrite the "|X:0<" part with spaces, which is 0x20 value in hexadecimal format for an ASCII space.
Save.
Done.
I tested some of these options. Some pointers:
- Load & Play Recording: Looks for a video file to playback.
- Play Recording vs Play Recording w/no views: I don't know the difference between these two, yet, but playback and takeover appears to work fine.
- Start Recording: Select this to begin a recording. It resets the mission.
- Save Recording: Select this to dump a .rec file in your game directory named after the current mission.
- Save .POS File: This dumps a .pos file in your game directory named after the mission.
- Clear All Objects: It really does just that. Don't use it if you don't want everything to disappear.
- Set Win Flag: This is all you ever wanted to get through that Free Flight Training Mission.
- IP Remote Control: I wish I knew what this did.
- The rest in this section: Not sure, but I certainly was able to damage myself with the "Take No Damage" option selected by crashing into a mountain. It might apply only to playback movies or to enemy fire.
- Helicopter FM: This is normal simulator movement.
- Edit n' Move FM: This is a debug/dev option to let you move the Comanche around. I think this may be useful if you're trying to figure out object placement for custom missions.
Note: The naming convention for saving and loading files is based on the current mission. So if you're doing Free Flight, the file name used for loading and saving a game recording could be "C1M6.REC".
Now -- let's think about how we can use these new features for good. I'm curious about a few things.
- Will recording and transferring game video dump files to other users allow them to use the playback and takeover routines?
- What in the world is the "IP Remote Control" feature? That sounds very... dangerous... fun.... what?