It would be convenient if one could have a floorplan view in the app. Here is an idea of how it could work:
You point your Homey-app to a suitable floorplan-file in PNG or PDF-format. This floorplan you are able to zoom in and out of, as well as pan around in.
Then you can drag and drop your devices onto this floorplan from the list in the Homey app, and use the dragged and dropped icons as you would in the “normal” control list.
I have tried to search for this in the appstore and here on the forum to no avail. Hopefully this would be a feature that more people would find useful.