Firstboot calls up2date so the user can register with RHN. Right now, the up2date window appears in the top left corner of the screen. It would look nicer for firstboot if up2date appeared in the center of the screen. Since you may not always want this for up2date, you could make a command line option to call something like self.win.set_position(gtk.WIN_POS_CENTER) from firstboot.
Currently just turned this on by default. Dont really see any reason not to. If someone gripes I can turn it off and add the flag. should show up 2.9.57
a --firstboot should show up in 2.9.63
Don't have a "--firstboot" option in 3.1.15-7, but up2date is always popping up centered for me, so guess that's the change.