How to disable sanity effect when looking at a monster?

[FragdaddyXXL]

I've seen a CS that had an idle Grunt you can purchase items from. Someone my know better than I, but it seems that they just took the model and removed its "enemy-ness" or enemy status, as it only had to sit there.

Would it be possible to make the model of a grunt behave like a waterlurker, as waterlurkers do not cause screen effects when looked at (if you call it being looked at )?