Our team is working on a product which has a feature that allow users to upload their avatar and edit it. Originally, we would like it to be like google (you can edit the size & position of the editable rect). However, due to the time and cost, we are not able to accomplish that.
Now we are thinking of doing it in the Facebook way. Users can edit the image, but the front rect are fixed. From my limited observation, I found that both Facebook and LinkedIn put a slider down below for users to scale the image, instead of a quick middle mouse interaction. I was wondering is using middle button a bad UX approach for web? And should the web avoid other mouse interaction except the scrolling and clicking? Thanks.