Currently, sequences are not handled at all and must have element building provided on a case by case basis. It would be nice to have generic handling that assumes no keys (numeric array) and provides a fieldset and "add more" functionality for the repeated field(s).
Potentially this could be an integration with multivalue_form_element →
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Very nice work. I have been wanting for something like this, and I came across your module by trying to find how an ootb admin settings form can most elegantly read/write a config `sequence` of values in the first place.