I don't agree ...
Of course, this is a risk to leave unexperimented users dealing with rules through a simple interface, anyway, if they don't have that tool and want to modify the rules of their firewall, then, they will try "by hand" like myself and beeing quite a newbie concerning Linux and E-Smith beeing a "special" Linux (especially concerning template configurations, etc etc ...), this could be far more dangerous as for their firewall than for simply the system ...
Why not adding a pannel which let us manage the firewall rules and put an option which can replace the modified rules by the original ones, just in case ?
This is not difficult to do ...