This idea is from GOML... as a player, and later from the pov of a server op, I found the option to swiftly eject unauthorized players from a claim/force-field to be really nice. Even teleporting in, by any means, resulted in an insta-bounce to outside claim/field boundaries.

The kill option is fun among the right crowd, but invites more player bad feelings and animosity in the be-kind/all-comers-welcome atmosphere we aim for on our servers, imho.

Apologies if this has already been addressed; the desire for this is coming from my own experience with the official Craftoria servers.