[RogueDrifter]

There's one thing... after doing some searches i realized that the gpci id of fake clients contain more numbers rather than letters, above 30 that is, so i did something like this and so far 0 false positives and worked against most if not all fake players, Do this at OnPlayerConnect:

PHP Code:

public OnPlayerConnect(playerid)
{
    new TempId[80], TempNumb;
    gpci(playerid, TempId, sizeof(TempId));
    for(new i = 0; i < strlen(TempId); i++)
    {
        if(TempId[i] >= '0' && TempId[i] <= '9')
        {
             TempNumb++;
            }
        }
    if(TempNumb >= 30)
    {
        new BotName[MAX_PLAYER_NAME];
        GetPlayerName(BotName, sizeof(BotName));
        format(TempId, sizeof(TempId), "Server kicked %s, reason: suspected bot.",BotName);
        SendClientMessageToAll(-1,TempId);
        Kick(playerid);
        }
    return 1;
} 


try this against them and let me know how it goes.