Dont Ip Ban do this (Long)

First
ip bans dont work 99% of users have a virtual/dynamic ip
so think about all those trial apps that deny you after the time expires
then think how you can expand on that when that
app must connect to a server to be used like a fps does

My Suggestion is this
drop a registery key with a unique id / coded value given by the server
on the first installation of the game
that would identify a particular computer with a crossfire application and a set of accounts server side
haveing been installed on it that key/id is not removed on uninstall of the game

Secondly its position maybe moved or copyed in the registry to a new position
on a update so that a new crack would have to be made
if it is ever figured out by a hack/crack

Payoff:
Then whenever a user is banned for hacking ie.. caught in replay
Not just that account is banned / deleted
but also that users unique id is added to a hacklist all accounts useing that id
are banned ie... all his accounts that he made on that computer are banned
including his non smurf zp account

Prevention:
now whenever the user makes a new account
he is Not prevented from doing so he makes a account logs on
however he is purposfully Not immediatly rebaned or prevented
from starting the application

Why:
the game on start sends the unique id to the server
the server then sees that this person has previously been banned
now the server ie... the devs whoever hold all the cards
now the devs can track a known hacker watch him in game see if hes in
a hacking clan see what hacks he uses or
the server can auto set a random date within the next couple hours or days
to auto ban his account again the reason is that its better that the server
bans then the client the client cant be trusted to even prevent the application from
executing

Another reason is this makes it harder for the client code to be cracked / disassembled
to boot you cant just delete the key and make your own because the server assigns it

(To make it even more difficult )
you could have one key that has the id and one key that is just a flag that shows
if the game has ever been installed

case1:
if the flag shows it has and the key has been deleted
the client exe knows somethings fishy
and if the client knows it can tell the server
case2:
if the flag shows that its never been installed before
and thiers a unique id that doesnt match any account then it
then the server knows somethings fishy as well

this could instead be a hidden file or what not

Note:
just for him to make a new account now he'll need a crack
so now not only does he need a hack he needs a new crack after each update
a new crack will be required because after each new update the place were the
id is at may have changed positions so the how would the crack know were the
server will place it

or

he could reinstall windows

thats a heavy price to pay for the avg script kiddie every time he's banned

if a user ever reinstalled windows
then a new id would be placed on his computer
but when he loged in his old id would be linked to his account
if its not on the ban list and his name and password was correct and not on the ban list
just change all accounts with the old id to the new id
or reversed tell the client to change the comps id value back to its old value

you have to think what a non hacker will do vs what a hack will do
and limit the hacks options server side
will a non hack reinstall the game occasionally yes
will a non hack reinstall windows once in a great while yes
will a non hack seek to alter critical game files no
will a non hack care if all his accounts are linked by a unique id that no one ever see's no
will a hack seek to use a script progi to alter game files definatly
will a hack want to reinstall windows every time hes banned no
will a hack want to reinstall the game every time hes busted if he thinks it will work prolly
will a hack want to make seperate smurf accounts for hacking seperate from his main most definatly