The textures would need to be customized anyway. I've noticed that they did some kind of odd texture wrap on some buildings, others had no texture at all on certain sides. If possible, I would break it up to have individually placed buildings. The various cityscape downloads state 300 or more individual objects.
The homepage of Outerra states: "Vector data are supported as well, with ability to define roads that naturally and seamlessly fit on the terrain, by adjusting the adjacent ground and refining it by the fractals. Vector data can be also used to define artificial regions with custom land type, such as fields or pastures. As a side effect of the universal fractal refinement process it will be also possible to have the artificial areas slowly degrade and return the land to its natural state."
Are these features that will be implemented later?
Also, if a custom terrain elevation mesh were compiled as a model, then textured with satellite imagery, could it not then be imported into Outerra as a model? -Woog