How to disable to use /me command?

Most people can use /me text when they are in mute by admin.
It's not good and i'm trying to find the way how to disable this function.

Guys with default rules have permission set "rok.fairplay", which has a lot of ingame permission and it is not real to make same set of commands to substitute this rules set.

Please, help me to find solution how to disable /me permission (rok.command.chat.me) and to stay "rok.fairplay" permission set.

I'm trying to find something like:

groups {
default {
default = 'True'
inherits = ''
permissions {
- 'rok.fairplay'
%disable_symbol% 'rok.command.chat.me'
}
nameFormat = '%name%'
chatFormat = '[008B00]Villager[FFFFFF] %name% : %message%'
guildFormat = '[00CC00][%guild%] %name% : %message%[-]'
}

I would say "Thanks" to every opinion you will post here.