ok, how to convert the main fs2 campaign to multi:
1, get vpview and extract all the mission files, all 80 or so of them, including the fc2 file (campaign file). The campaign file could take a little looking for, but its there somewhere.
2, open up fred2, press "shift+c". this will bring up the campaign editor, open the main fs2 campaign file. Delete the first 3 or so missions (training missions, pain in the rear to convert, not worth the time) from the file by clicking each of those buttons with the mission names on them and hitting delete after each.
3, open the first mission, press "shift+n". This will bring up a new window, which will have a number of options. Click on multi instead of single. close this window
4, double click on alpha 2, there is a check box labled "player ship" check it. do this for alpha 3 also if you want 3 players, for 4 as well if you want 4 players, and so on. You dont need to do this for the ai to be there.
5, save, open next mission, repeat steps 3 and 4 for every mission you want to convert.
thats it, no i wont do it for you, i dont have to 2 hours or so to spend on it as i have so many other campaigns to work on. Good luck, have fun.

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158th Banshee Squadron
http://3dactionplanet.com/hlp/hosted/the158th/ Into the Night Campaign
http://3dactionplanet.com/hlp/hosted/the158th/itn/