Hát én ezt így oldanám meg :
[pawn]forward SendAdminMessage(color,string[]);[/pawn]
[pawn]public SendAdminMessage(color, string[])
{
for(new i = 0; i < MAX_PLAYERS; i++)
{
   if(IsPlayerConnected(i))
   {
                if(PlayerInfo[adminlevel] > 0)

       {

         SendClientMessage(i, color, string);

      }

   }

}

return 1;

}[/pawn]

[pawn]public OnPlayerCommandPerformed(playerid, cmdtext[], success)

{

if(!success)

     {

     new Sztring[128];

     new pName[MAX_PLAYER_NAME];

     GetPlayerName (playerid, pName, sizeof(pName));

     format(Sztring, 128, \"ADMINÜZENET (%s) [%s]\", cmdtext, pName);

     SendClientMessage(playerid,-1, \"Nincs ilyen parancs!\");

     SendAdminMessage(-1,Sztring);

     }

return 1;

}[/pawn]