In addition to what Beagle said, I don't think this idea is going to work either. I have a feeling that there's going to be much arguing between players: whether Player A was close enough for Mutant A to be able to kill him/her or not.
Other than that, I think the current Mutant rules are just fine the way they are - allowing Mutants to be able to kill players in certain areas above ground will likely become a huge catalyst for a lot of conflicts if you ask me.
Sorry, but it's a -support from me as well.
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