- Not quite what you need, but some work has been done towards such an index in the Great Apocrypha Collection.
Needs to be updated and consolidated, though. Now that there are Ars wikis out there...
- Well, you got plenty of strands to weave a campaign from as there are a number of published adventures for previous editions and the books in general are chock-full with story seeds. If you want adventures that span significant portions of Mythic Europe, have a look at the Land of Fire and Ice saga. Deadly Legacy also involves significant travel, as do
But it's true that there isn't a fully worked out campaign. One reason probably is that it would be of rather limited usefulness if you are running your own saga. Smaller story seeds are much easier to integrate.
- Last time I went to Jeux Descartes Messonier (métro Wagram), they did stock a book about how a medieval world is affected by all those factors. It's relatively system-independent (although you can feel some of the D&D bend). I can't remember the title, but last I saw it, they had it stocked in the Ars Magica bin (go figure).
Again, not really what you're looking for, but shrug.