[Scenario]

There's no reason whatsoever to add an if-statement for every command. You're using ZCMD, it has some callbacks that you can use.

pawn Код:

public OnPlayerCommandReceived(playerid, cmdtext[])
{
    if(!pStats[playerid][pAuth])
    {
        SendClientMessage(playerid, COLOR_YELLOW, "* "COL_WHITE"Using commands is "COL_LBLUE"prohibited "COL_WHITE"until after you're logged in.");
        return 0;
    }
    return 1;
}

That's a snippet from my GM.