[XxAvalanchexX]

lucKy: Try replacing the cmd_setaim function in the original with this one:

public cmd_setaim(id,level,cid)
 {
    if(!cmd_access(id,level,cid,3))
        return PLUGIN_HANDLED;

    new arg1[32], arg2[32];
    read_argv(1,arg1,31);
    read_argv(2,arg2,31);

    new intval = str_to_num(arg2);

    if(equal(arg1,"*") || equali(arg1,"@ALL"))
    {
        new i;
        for(i=1;i<=32;i++) aiming_good[i] = intval;

        console_print(id,"* All players %s aim good",(intval) ? "now" : "no longer");
        return PLUGIN_HANDLED;
    }

    new player = cmd_target(id,arg1,10);
    if(!player) return PLUGIN_HANDLED;

    aiming_good[player] = intval;

    new playerName[32];
    get_user_name(player,playerName,31);

    console_print(id,"* %s %s aims good",playerName,(intval) ? "now" : "no longer");
    return PLUGIN_HANDLED;
}

Then you can use * or @ALL to denote all players.