The default setup for Gnome’s GLslideshow is highly annoying on Fedora 8, and there’s not an easy way for users to individually configure it. Here’s how. As ‘root’, do the following:

Edit /usr/share/applications/screensavers/xscreensaver-glslideshow.desktop and replace

Exec=glslideshow -root

with

Exec=glslideshow -root -duration 15 -zoom 100 -pan 1 -titles