My approach is simple...fixing the in games level list so they spawn no more then an any other creature in game.
the issue is I have never done this before and would like to know what other people think could be add in to replace those deleted cliff racers. I realize this has been done before but I figured, it would A. be a less extreme approach (more a kin to a fix) and b, be a good way to practice with the cs and level lists