i’m Interested in to knowing. Does the Ubuntu MATE Team plan adding any other Mate Tweak themes? or Maybe adding a community Function To add more themes? or make their own themes that edit the Actual UI. some gtk3 themes Don’t fit the Ubuntu Mate default or other Mate Tweak themes.
Or adding the ability to save custom panel layouts using a User supplied name instead of Custom: santafe tweak, so the user could save more than just one custom panel. And to go with it, an option to delete custom panels would be nice also. 
But that’s just my little wish list. 
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Or Maybe The Option To install a theme by File
Or At Least be able to suggest a theme.