Actually I don't think the coding part would be very difficult, that is why I had doubts that it was an actual feature. I guess my biggest challenge would be for finding the appropriate distances for each particular level, but it seems like that all could be configured into a skill variable.
The problem I would worry about would be all those entites scanning for distance from player even when the player was not around might take too many cpu cycles, but I will look into coding it for myself.
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If this is the only feature you need from the next higher version, you can do it yourself with c-script.
very true.