I am confused! I hate home screen in portrait mode. I got launcher pro and it does my home screens in landscape mode automatically. It is so cool. If I need more screen space, then I pull out the key board and use it.
I went ahead and got launcher pro plus, but I can not remember why at the moment.
I do remember reading that "stock" you can only have landscape with keyboard out.
I did not know that launcher pro works either way. I just found out once I downloaded it. It is cool.
If it does not work that way for you, let me know and we can compare some settings.