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Ah, sorry I've already come pretty far in writing my own editor.  It supports the 9 cells per tile with full zoom, pan, variable materials/terrain.  I just  need to add the UI elements for add/remove material and the XML persistence code, and it will cover the same immediate needs I had of Tiled, with the benefit of being very easy for me to evolve alongside my game.   It also gives me the opportunity to throw in game-specific metadata and other features, which will be important for procedural generation.  Really, I should have gone this way from the start.

I appreciate the response, and I think it is great you are providing a tool like this for people who, perhaps, cannot make one or would prefer not to spend the time doing so.   And out of those I demo'd, yours was--by far--the most polished and pleasing.  Cheers!

Sure, sometimes it's better to roll your own solution (or sometimes people fork Tiled and add whatever they need to it, since it's free software after all). Your use-case is still something I'd like to support in Tiled as well.