The thread here http://www.primothemes.com/forums/viewtopic.php?f=5&t=591&p=3947&hilit=404#p3947 says:
"I realize that some site owners would prefer NOT to cache 404's at all. So it makes sense to have an option for this."
Am I missing something, or has the option not been implemented yet? It would be useful for using with Fail2Ban.
Cheers,
Mark...