Hi Richard Cross,
Unfortunately you cannot set image map from within Image Widget.
To do this you can use 'Content' block
1. Add Content Block to Page
2. Click 'Edit' link
3. Point to the toolbar of the text editor - and click on Image Manager icon (CTRL+G)
4. Follow the wizard and upload an image
After image is uploaded
5. Right Click on the image> Select 'Image Map Editor'
6. Under the Image Map dialog - select the image area and enter the page u want to open in the URL field (in your case - ~/home)
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