I posted this on the KiCad developers mailing list, but thought I’d re-post here to gather feedback from the KiCad librarians as well (as I understand it, it is easier to reach you all in this forum?)
I’ve made a start at specifying what pad stacks might look like in KiCad (probably v7, but I am hoping to help get it in before v6 feature freeze). The main reason from my point of view is a CADSTAR importer that I am working on (I’ll make a separate post about that once I have something working): CADSTAR relies very heavily on pad stacks, so importing a design to KiCad is limited at the moment due to lack of support for more complex pad stacks.
You can view the draft document here
Could the librarians who are interested in this let me know and I’ll add them as “editors” of the document?