Don't put a version number on the techniques document. Whether the techniques document will be a Note. I think it's hard to understand priority ratings without this information. Also, barriers change with technology. Where to put this.
Text is an absolute requirement.
Auditory is less important if text is synchronized. The guidelines provide at a priority 1 level some underlying text for all important content. I don't think we should do this. I like a lot of the elements in the proposal. The proposal elevates the concept of equivalent.