1) Which Jane Austen book would be most improved if there were a few Aes Sedai thrown in? How so?

While "Pride & Prejudice" is already a great book, adding one Sister from each Ajah to manipulate and complicate matters would make it even funnier.

2) How do you imagine the One Power was utilized in food manufacturing during the Age of Legends?

They most likely used the One Power to boost plant production & growth, establish Keepings to preserve the food in large quantities and the more scientific minded probably researched using the One Power to create new varieties of foods that would feed more people.

3) What has been the most erotic scene in WOT? (this is a tough question, I know)

Gawyn and Galad fight Mat at the same time. There was more passion in that scene than all of the sweat tent scenes combined. I have an entire alternative fan fiction built up in my head where Gawyn and Galad are both in love with Mat, and are fighting for his affection.

4) Why did James Oliver Rigney choose Robert Jordan as his pen name? (and isn't that a great novel by Hemingway, For Whom the Bell Tolls?)

I'd think that he must have chosen the initials from the first words in his last and first names, and then made up something plausible, yet dashing.