Plugin Help Simple AntiSpam / AntiFlood for Commands

Hello Bukkit.
On my server we require that a player types /g {message} to talk in global, as the default chat has a 50 block radius on it. however I have had a hard time finding a plugin that will block spam and flooding of the chat while using /g {message} I have tried many plugins like NoCheatPlus, PWNFilter, and ProSpam yet none of them will block spam in the /g {message} command.... even though they all advertise that they will filter commands... if anyone could give me some pointers on how to filter my global chat that would be great
Thank you,
and
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