This would be a very useful feature for me. I often want to take an image to focus on part of a drawing, but greying out the rest of the model. I do this by grouping then selecting the group, then use the snipping tool, but it also captures the bounding box.
To prevent the bounding box from appearing in the image, you can expand it by inserting larger elements (eg. edges, guide points) inside the group, but outside the visible area.