I could imagine that it would take quite a bit of time to do this since it's not just setting a ::dice or ::dicing command to the castle wars area. The anti-scam dicing option is build together with flower poker.
You would either have to make two seperate pieces of software (and interfaces) and remove the dicing options from the current gambling interface at ::fp or make players unable to click both dicing options at the fp area and flower poker at the dicing area (but that would be ugly imo)
I understand that it doens't take like hours to fix but if you look at the demand for gambling (both now and before the gambling update at ::fp) it's not really worth it to possibly boost the interest for dicing games. Maybe that people would dice here and there after an update like written above is done, but after a while I think dicing would become dead again.