- Do you consider SUMo a complex product or not?
- Do you want to split your accessibility report into several sub-reports or do you prefer to keep it in one report?
VPAT does allow to use additional information and sections. It also allows different report formats. And in section Best Practices for Authors, there is a sub-section Multiple Reports on page 9 raising the above questions. So while your scoping clarification is in violation of VPAT, it can be rendered into that direction in case of complex product structuring. VPAT doesn't allow scoping below product level. But VPAT allows sub-reports to address those components or functional areas below product level, implying at least cross-references and a reasoning in the mandatory notes section. It does not prescribe how to identify the overall report and its sub-reports. That choice is left to the authors of the accessibility report as long as they meet the minimum requirements of VPAT.
It seems to me that a significant part of SUMo user base is located in the US, the EU, Russia, China and Latin America. I don't remember if it was Brazil or some other Latin American country in focus. Since version 2.0 of VPAT, it does not only cover aspects for the US but also for the EU and for global web standards on accessibility. I don't know to which extent Russia, China and Latin America have also defined accessibility standards and for whom they're binding to which extent unto when. Perhaps there are readers of the forum located in some of those regions and may provide feedback with references or links to such standards, guidelines or criteria, hopefully also in an international version in English or French. Extending your draft report by such standards is possible and not conflicting with VPAT.