[Threshold]

Hmmmm... would this work?

pawn Code:

CMD:sendcmd(playerid, params[])
{
    new npcid, sendedcmd[150];
    if(sscanf(params, "us[150]", npcid, sendedcmd)) return SendClientMessage(playerid, 0xFFFFFFFF, "USAGE: /sendcmd [playerid] [cmd] [cmdparams]");
    if(!IsPlayerConnected(npcid)) return SendClientMessage(playerid, COLOR_WHITE, "Invalid player!");
    if(!IsPlayerNPC(npcid)) return SendClientMessage(playerid, COLOR_GREY, "You can only use this command on NPC.");
    if(OnPlayerCommandText(npcid, sendedcmd) == 0) return SendClientMessage(playerid, COLOR_GREY, "This is not a valid command!");
    format(sendedcmd, sizeof(sendedcmd), "/sendcmd %s.", sendedcmd);
    SendClientMessage(playerid, COLOR_WHITE, sendedcmd);
    return 1;
}