Explain, what use of . is that you speak of.
From the help file:
If you want to force a command to perform quietly ie. without printing out any information, then you can prefix it with a "." fullstop.
The theme here is "quiet". Yes, it's a different type of quiet... with /commands it only quiets display output... but with $identifiers it will quiet "inputs" from being sent to mIRC and the server.
I can't imagine anyone becoming honestly confused with this use of the prefix. It shouldn't be any more confusing then commands that being with ! to prevent it being processed as an alias, and identifiers that use ! to delay evaluation.
- Raccoon