I believe the reason for not having an L4D extension was that it wasn't really necessary (although targetting teams is always useful), same reason there's no DoD:S extension (being able to target teams would be useful there too

). I think entity touch hooks are too generic, that should be in an extension that works on all games (provided you have the signature for those games). I can't think of anything L4D specific that needs an extension.
Well... other than being able to call functions on Director
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