Collage image handling

I really like the Product Designer but i have two problems with the handling of the images in collages.

1. The images can be moved or scaled outside the collage tiles - in normal mode and in the advanced editing mode. For me this is a major problem, the image should always cover the tile.Is there any option to prevent the image being moved or scaled outside the tile?

2. Changing images in tiles is too complicated. When you want to change an image  you need to delete the image first. You cannot simply replace the image with another one by clicking on it. If you try to do this the image will placed over the whole collage and all tiles. You can only remove it with the undo-botton. I think when you click on an image that should be placed in the active tile.

Thanks and greetings from Austria.