1. What is the general goal of the feature?
Enabling comments on the "survey" page of xlsforms would make them easier to read and maintain. This could be done by adding a new question type (e.g., "comment") that the compiler would ignore as if it were a blank row. The survey developer could then add comments and explanations relevant to various parts of the survey logic. The comment and notes features of Excel do not work well for this purpose, because they do not remain on the original cell when rows are added or deleted, but must continually be moved by hand back to the proper location on the spreadsheet.
2. What are some example use cases for this feature?
Xlsform is in effect a sophisticated and powerful high-level programming language. Surveys can be quite lengthy, with complicated skip logic, external datasets, and many other features. Using extensive comments is generally good coding practice, essential for all but the shortest and simplest programs.
3. What can you contribute to making this feature a reality?
I would be happy to help review and test this feature.