Its easy peasey.
There are two ways; you can use the FACEDIT program that comes with Alien Crossfire, load up the new faction in it - save it, and select "Add New Faction to Game" when it asks you too.
I dont recommend it as its a bit buggy with the blurbs and such like.
The other way is to manually edit the alphax text.
Open it, scroll down to where it says #CUSTOMFACTIONS just below, #FACTIONS and #NEWFACTIONS near the bottom.
And underneath #CUSTOMFACTIONS add the name of the faction file you want the game to look for for example if you had a faction called The Fremen and the file The Fremen use is fremen (fremen.txt, fremen.pcx etc) then just write FREMEN, FREMEN.
Viola.
Simple.
And Gelion maybe he did look and maybe could have gotten a bit lost and stuck? Its easily done - theres really no need to be a sarcastic nasty clod about it to him.
It would have cost you nothing to actually help him, and if you didnt know yourself well frankly you shoulda kept your fingers to yourself. As my mother always said - if you have nothing nice to say say nothing at all!
He only wanted some assistance cos he was confused and lost after all.