The Spaniard has scored four goals this season and Stevens says the secret to keeping him sharp is to mould the team around him.
"I don't think you can treat all of your players equally," he told the Bild newspaper.
"Raul does not have to go into sliding tackles. He has got to feel happy and be treated like Franck Ribery at Bayern.
"If you give such a creative player more freedom, then he will give it back to the team."
Raul still has a year left to run on his contract with the Royal Blues and, although Stevens admits it is too soon for him to make such a decision, he would like to work with him beyond next summer.
He said: "I have only been at Schalke for a week, but it is incredibly enjoyable working with Raul.
"He is a super professional and an absolute family man."