I have a couple of questions. Is it possible to import cycles scenes into blender render?
I know it is not possible rendering hair in cycles 2.63, but can I render the hair in blender render?
Could I use Luxrender or Yafaray to render hair? What is the format you can use to export the scene from Blender to these external render engines?
You don’t have to import from Cycles to BI, they are just the two different render engines in Blender. You can’t translate the surfaces directly between the two, however.
Luxrender and Yafaray builds are available through Graphicall.org and you can download exporters and add-on for them from their respective sites including instructions on how to use them.