What you are describing sounds interesting, but I’m afraid it’s beyond the scope of what this does today. Being open source you are free to customize our code to get your desired functionality. We will keep your idea in mind when we get a chance to work on new versions.

technically this theme shouldn't be considered "open source" because it's not free to use.

What do you exactly mean with "its not free to use"?

I'm sorry, i'm wrong. Supermint isn't open source and not free to use.
But you can customize the code as you want.