[dominik523]

I would try to make something like this using OnPlayerCommandPerformed:

pawn Code:

new LastCommand[MAX_PLAYERS];

public OnPlayerCommandPerformed(playerid, cmdtext[], success)
{
    if(tickcount() - LastCommand[playerid] < interval)
        return 0;

    LastCommand[playerid] = tickcount();
    return 1;
}

EDIT: I'm really sorry. I thought you want to make anti command flood. Well, you could use the same thing but only in other callback (OnPlayerText).