I figured out a way to add bots (though they are all Egon) all you have to do is press the ~ button to bring up the overhead display, then type addbot. make sure teamplay is on. if this doesn't work, bring up the overhead display and type teamplay “3” or any other number. Just remember the bots aren't free thinkers and they won't attack Mr. Staypuft or Gozer the Gozerian, though they are helpful against Vigo if you remember to put weapons stay on.