Hey, thanks djc0.
Besides, Bernhard Baehr, the SleepWatcher's developer, replied me on this too. Here's his recommendations:

... removing SleepWatcher is very simple:

Drag /Library/StartupItems/SleepWatcher to the trash. This removes the startup item, and with the next restart, SleepWatcher is deactive. To remove the Unix components, you have to execute the following command in a Terminal window:

sudo rm -f /usr/local/sbin/sleepwatcher /usr/local/share/man/man8/sleepwatcher.8 /etc/rc.wakeup /etc/rc.sleep

But it doesn't matter to let these files installed, they do nothing than occupying less then 20 kB of disk space.

So, it was very simple and worked to solve the long sleep delay of my PowerBook and the errors monitored in Console. Now it's clean... unfortunately because I would have liked the mod to work (I thought I could unplug a FW HD when the PB's in sleep with this tweak).

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