Slider Imagle Size Constraints

So I know a little bit around the editor but making adjustments on the slider is giving me a little trouble. I’m not sure if what I’m trying to do is possible but if anyone can tell me what to edit and how it would be greatly appreciated.

I am considering switching to the Deepfocus theme which has a nice slider that flexes depending on the image it’s showing. Sometimes it stretches the images so far down you can’t click to the next one and you have to scroll to find the controls.

I basically want to freeze the slider so it always shows a 960×300 image. That way the slider controls always remain in the same position. I also want to make sure my images aren’t distorted to fit within the size. So if I have a 960×960 image I don’t want it squished vertically. I just want the center 960×300 section of the image displayed and the rest can be cropped.

Any ideas?