like I said cheaters are not a problem for us, we have not as popular server as yours and if there is new player coming we watch him closely and can say in short time if he cheats or not.XP working very good and not having GUID is a rare thing but I saw few players that didn't have it but next time they came they had GUID (not sure why it works but it does). Hardware vary from older to newest and best but still lags and lags coming suddenly for period of time and may be smooth playing for 10 min and hit again like every 3 sec peak. This game was made for Pentium III and playing on Pentium 4 or higher shouldn't give problems especially with newest video cards with power that wasn't in your wish 6 years ago.
Game play nice anyway without pb so is not a game but pb check that evenbalance screwed so bad and don't even care to fix it. Like Dragon said SLAC maybe a solution but would have to see it to believe it and as far as I know they plan to release it for pub also.