Allow mind map nodes to be shapes, stickies or images

I use mind maps a lot (because I enjoy how easy it is to create them, add nodes, arrange them, and drag them around). I suspect the auto-layout has a lot to do with my preference of mind maps over working with shapes and stickies. However, sometimes I need to connect images, stickies or shapes to a mind map and I’d like those objects to be treated as a node (so I can arrange them and drag them around as easily as I do nodes).