Trigger Logic: Keyword Logic

The keyword logic is very simple
It is like a password for players
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For example:
The owner/member of a project sets 
the keyword logic
And typed "Kogama" in the text box

Then after it is published
It will be played of course

When a player says the keyword
"kogama" In the chatbox
It will appear as something like
[DrVista]: [Keyword Triggered]
Or maybe if possible:
The Player who triggered the
Keyword Logic will be the
only one who will see
the Triggering Message.

Is this a useful thing for kogama?