I cant speak about editing the swf's, because that was a loooong time ago. I do know that the new 'ban system' is set up on a comparison chart. When a player cheats an upgrade, be it by a day or a week, a flag pops up. maybe you will get by with one or two flags (*say ONE unlock vehicle cheat) but when we unlock all vehicles, upgrade several buildings and all air to 8* this throws several flags!! KE starts looking for the money, which of course doesnt go up. Boom! You are banned because your flags dont check out. One flag+ a little $$= you are fine. 20 flags+ $0.00= Perma Ban!!
Of course i dont literally mean a flag pops up inside a computer, i only mean some sort of alert system says the comparison is 'out of range'.