One cool thing is developers don't have to bother using the dialog-hack [matchbox-wm handles dialog windows as non-fullscreen-windows] anymore.
The could boost porting speed.
With fluxbox all windows open independently of the others.
I checked XBoard. The dialog windows which opened as fullscreen w/o fluxbox are now useable.
# screenshot: You will start the windowmanander fluxbox like all other apps. Cool - no hacking or so needed. Starting the fluxbox entry kills the pagebar and shows the fluxbox bar. When you start your iLiad the next time it will start with original windowsmanager again.
[If have to setup an installer now
- the same method like XBoard, Abiword etc.]