We (Olark) specifically decided not to implement the "read-ahead" or "sneak-peak" feature because we thought it was creepy and broke customer expectations.
When you are typing a message to customer service as a customer you should have a chance to compose your thoughts, and should have an expectation of privacy in whatever you are writing before hitting enter.
When you are typing a message to customer service as a customer you should have a chance to compose your thoughts, and should have an expectation of privacy in whatever you are writing before hitting enter.