Unpredictable plot line, unique dialogue and action sequences, good character development. E-mail is a beautiful thing. I e-mail the agents whenever something has come up for that client. We are always cc'd on any correspondence regarding that client and vice versa. Usually, if we're trying to get a client hired for something, one of us will call the studio and the other will work the producer.
Most people are unrealistic.
Part of my job is to know what actors and directors are looking for. Also, no actor or director will consider a script that is not set up at a studio unless they have a production company that will allow them to produce. It's just not realistic. Unless it's his idea and he wrote the script as well as directed and produced, I personally think a possessory credit is absolutely uncalled for. I wish I knew.