Feature request : Icons on groups

[e-motiv]

Thanks to the developer(s) for a great addon which I use hourly!

Further on a small feature rekest: Allow icons on the main groups (not the tabs themselves but the root group).
Subnotes:

• To allow some standardization and to see it is a group, one can use the icon from today as background and the new icon on top of that.
• One possibility could be to choose an icon from one of the tabs below.

P.S. Didn't find a comment or feature request list (I searched 5 minutes), so I hope this place is OK.