actually wanted to find that out, BUT whats cool about tools like mani is that you can use normal say commands to exec admin commands, like "@say hi my name is Bob McGee, what would you like on your burger."
but if you are refering to like normal rcon commands ya you can. I dont think you can custom make a message mode like you could with HL engine.
I hope this information helps, if you need me to elaborate then ask.
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