Hi there again.
Currently I'm looking for ways to optimize rendering and/or enhance the visual richness at the same time.
So I was thinking of these:

1. Can a terrain be rendered with more than 3 textures? (even by custom shaders). I feel the need for extra detail.

2. Can a terrain have a normal map?

3. Can a terrain benefit of parallax?

4. Can someone please enlighten me about the light map of a (large) terrain - is it one large texture? If so, how doesn't it cripple the performance (memory)?
I'm asking this also because I have an interest in using large textures for different purposes.