I noticed that nobody has posted one of these for A3, so here it is.
Since I can't figure out how to upload a file to this forum (Thanks to whoever can tell me), I'll just post the script I changed.
From the scripts folder, open z0nightshade.txt, find
change_level(-1,-1,-1,2,-1);
and replace with
change_level(-1,-1,-1,5,-1);
This will allow you to select up to 5 companions when exiting camp nightshade, despite what the text says.