Regarding the map engine, I do want to implement the Sphere 1.5 map engine. But I'm planning on doing it in script, using the new API from the engine to implement it.
This, this would be neat to see. My Sphere engine has a fast map engine, but it's done in C# and not JS so it has zero extensibility (like the old engine). It turns out you do not need a very fast map engine, but one that is fast enough. I still need to implement the new proposed Sphere shape/group graphics API (was it called pegasus or something like that)?