Things may have changed but I was told by staff before that you shouldn't cheese @lp/tp/sp messages. In this case I was told that I should not set my @lp or @tp to something like 'is sleeping here.' Or to any message starting with that like 'sleeping here, snoring.'
I imagine that there may be other phrases that fall under such restrictions like 'is lurking in the shadows.' As, like with the sleeping messages, it is something that has mechanical significance. Though I am not sure if this phrase is covered or if there might be others that are covered.
My thought is that, if such phrases are not to be used in @lp/tps, why not have the game check for them when a player tries to set an @lp or @tp. If a no-no phrase is matched, the game informs the character that they can't use that @lp or @tp because of reasons.