The term drug can be used broadly. Some may refer to
Harmful substances like cocaine
Drugs for treating certain ailments
Drugs for changing ordinary behaviour.
There may be a similarity between each of them. For example, a drug that calms the nerves of a person may be also used to 'drug' a person so he/she is in a 'modified' state of mind.
Now to the answer. For a person to believe in Islam and sumbit his/herself, that person must be in a right state of mind. If a person is drunk for example, he may not be in a clear thought about what he is uttering. In a similar manner, I think that using a drug to enhance a person's behaviour has the same effect.
It is drugging the person and 'forcing' him to think and behave differently.
So, as a story, you may be able to say that the community where such 'drugged' people live is a calm and peaceful environment. However, this would be unreal and when the drug dies off the bodies turn back to their normal states.
As such, I think from an Islamic point of view, this sort of behavioural modification wouldn't be valid.