Seems like just barely cracking your window to slide out the license would raise a huge amount of suspicion to the officer.
An officer can have all the suspicion he wants, but without evidence, he can do nothing legally.
If he steps beyond his legal authorization, everything beyond that point in time, will not be allowed as evidence in a court of law.
That's not entirely true - in a traffic stop you really are at the mercy of the cop in a way that you would not be hardly anywhere else. You are just as much at the mercy of the cop during a traffic stop as you are going through security at an airport.
Its not fair, but a cop can really make your life hell during a traffic stop if you rub him the wrong way. If a cop wants to (as has been discussed in this thread), he can find a reason to search your car and take it apart - you appeared nervous and wouldn't roll down the window. During this time you may be cuffed "for the officer's safety".
You are especially in for a hard time if you happen to have a gun in the car - legal or not. If you are traveling with a dog, odds are that it will be shot if it tries to protect you - again, "for the officer's safety."
You're just playing with fire when you appear suspicious to a cop during a traffic stop. Be polite, have your documentation ready and say as little as you have to.