Rated 5 out of 5 stars

@Lascaris re. your comment "I would suggest a visual improvement for a next version : that would be great to put images as a background screen in each dial group. The use of customized colors in the background is a good mean to make visual contrast between the different dial groups, but it is visually poor."

you can set images as backgrounds - right click on background > edit group > additional style options

This review is for a previous version of the add-on (0.9.5).