How can I convince my department that I have the academic freedom to select textbooks and use multiple-choice tests in my courses?
As a current undergraduate student who recently attended a Community College I personally agree with at least requiring all professors to use the same textbook. It means that students from different sections are able to study together more easily than if the books and overall approach to course are different as I'm seeing in some courses at my current University. At least some Community Colleges allow you to change courses up to at least one week into the course with no extra fees, which means that if you find a professor doesn't suit your learning style you can change to another professor, but if you need to buy another text book that would become significantly more difficult for those students. This is especially important in a multi-course series like Calculus where its possible that you could purchase the textbook for the entire series for a fraction of the cost of purchasing the book for each course individually.

I know I'm probably in the minority regarding Ebooks as a large number of my fellow students in the time I spent at a Community College preferred them, but I always preferred a physical book as most Ebooks come with a subscription of some kind which requires renewal every semester for a significant portion of the cost of the book.

And as a final point regarding selection of teaching material, it seems that your department only requires you to use the textbook they decide is best and you are able to supplement your teaching materials with animations and MatLab objects as you see fit. This was a very successful scheme for my Calculus 3 professor as they were able to quickly show us what the concepts looked like as 3D objects in a way they would have been unable to on a blackboard.