Screensaver and security

Mac OS X's screensaver is not a reliable way of locking your screen. After the methods enabling one to deactivate it without the password, now it's been found that if you type something before the login dialog appears, that something is transmitted to the active application behind the Screensaver ! If you have the terminal window active, someone could just type more or less dangerous commands while you're away. Even if the terminal is not open, there is a potential annoyement, because commands can be type in sequence, and keyboard shortcuts such as Command-Tab are transmitted.
It's not a major problem, however you'd better be aware of that, if you ever use the screensaver to lock your computer at work.