It would be REALLY helpful if you put a check box on IPCOPs web interface at Traffic-Shaping section which would say "Constant Bit Rate or CBR" so as to give CBR maybe based on CBQ or whatever you think is more convenient so as to provide CBR for critical real-time apps such as VoIP telephony and guaranteed traffic for video broadcasts and such...
Keep making us PROUD! :-)
With DEEP respect to your project,
George Delaportas (qtgeo)