oh.. ! you're right many perfect world type asian mmos have inbuilt official bots.
the other one that springs to mind is: Supreme Destiny (asia based mmo, has official bots).
some other mmos let you level while you are offline (Eve is one).
Be warned - I am a major player of Regnum Online the mmo. I've been playing it for about 2 years and rarely go without logging in at least once a day. You can also look at good alternatives to Regnum such ase Aion online and Aika Online.