How can I bake normal map detail into a terrain light map?

(posted this in the support forum as well, hope that's OK)

Hello!

When normal-mapped objects are lightmapped, the sculptural shadows and highlights are baked into their light maps. So the baked object no longer has an actual dynamic normal map, but instead has a static light map that makes it look like it did in its normal mapped state. I expected to see the same behavior from normal mapped terrain, but can't seem to get it to work.

Here's an illustration of what I'm seeing:

And here's a screen capture video that perhaps explains the problem better (there's voiceover, so you'll need sound on):

http://screencast.com/t/AHdYXhIaFya

It really seems like this should just work... I'm not looking for normal-mapped terrain post-baking, just normal mapped detail baked into the light map, the way it works for an object.

Any help would be greatly appreciated.

Thanks!

-Spencer