To remove the splash screen, use <xscreensaver -no-splash>. To alter the timeout and actual screensaver, add lines to your .Xdefaults or .xscreensaver file.
E.g. if using an .xscreensaver file,
Code:
timeout: 5
programs: flow \n qix\n
Otherwise, just use the xscreensaver-demo program to create your .xscreensaver defaults file.
Cheers,
mj