Currently if I use either the mouse wheel or the keyboard, you get the effect that you see in the video. The camera will move out by a large amount. In the video you see the view zoom out 3 times, which was me scrolling my mouse wheel three times. It would be nice to be able to zoom out smoothly the same way I can make the camera move around. Perhaps the ability is already there, and the jerkiness of the zoom motion is caused by my Windows mouse settings being "1 line" per mouse scroll - and I can't find a way to turn that off. But then again, pressing the W and S keys to move in and out creates the same behavior - a single tap of the key will move the camera in or out by a large amount.
I just want to be able to smoothly pull back or move in on things in the scene.