I don't know if this is intentional, but I can't imagine it would be, as every form can be modified in interfaces. 

Hitting the + button on a Kanban stacking field opens up a form that can't be customized.

Only the fields that show on the record as they appear in the Kanban stacking field itself show up on the 'add a new record' form.

Is anyone else experiencing this? It makes the Kanban field almost entirely unusable, especially for users who don't quite understand what's going on.

Or am I just doing something wrong?