Sorry.What I meant was.I think is way easier to make maps into Tiled and export them into Neo but this way as you said we use apps what are not created by us.Which is not a good thing,I think.So maybe a basic paint tool(for tiles)should be made?In this case I can try making this but I need a short tutorial/explication on how the engine works.
Also I strongly suggest a TODO list with all the features that needs to be added in Neo both for 2D and 3D.