[zxc1]

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(!strcmp(cmdtext, "/setscore", true))
    {
        if(!IsPlayerAdmin) return 0;
        new tmp[128];
        tmp = strtok(cmdtext,idx);
        if(!strlen(tmp)) return SendClientMessage(playerid,-1,"Usage: /setscore [ID] [SCORE]");
        if(!IsPlayerConnected(tmp)) return SendClientMessage(playerid,-1,"Player not found.");
        new id = strval(tmp);
        tmp = strtok(cmdtext,idx);
        if(!strlen(tmp)) return SendClientMessage(playerid,-1,"Usage: /setscore [ID] [SCORE]");
        SetPlayerScore(id,tmp);
        return 1;
    }
    return 0;
}

Made now, not tested.
Like this?