[DiapDealer]

For the purposes of this discussion, I really think we should separate #1from #2 & #3. In other words: "how do we want to treat #2 & #3?" And then "how do want to treat #1?"

Lumping them together only creates confusion, I think. Especially in light of the fact that I think #1 is a no-brainer: make it a manual menu option (so people can validate without having to save first), AND automate it upon Save(As), if feasible (because having manifest properties properly set is not an optional part of the spec, and properly setting them will never cause problems).

That leaves #2 and #3. Which I think should be combined into one, backward-compatibility action, and should be optional. Whether it's optional because it's left as a manual menu-action only, or because the user can opt out of automatically having them happen upon Save(As) makes no difference to me.