Yeah, it's the same like that in the usersettings.xml file in windows, which lays in the Aquaria directory.
I just tried it out, by doing what PiSketch says, the logo will pop up on a white screen, then face and you go to the main menu, it's not THAT much faster, but it's certainly shorter.
The value to change is near the bottom of the file, in the list 'demo'.