Hello. Hope I can help. I too have the BCR200, just bought. The easy one first is the Next and previous for navigation. I use the buttons in the lower right hand corner. I have sent them (4) as undo redo top 2, and prev and next on the bottom 2.. My zoom options, I'm still playing with. IT is not smooth and I have not played much with it. LR does not have a simple scroll zoom in and out. But there is a funtion of zoom in a little and zoom out a little. But it is not a encoder, but a button selection. Let us know if you come up with a solution for smooth zoom in/out