As I was perusing the Plant Delights Nursery website looking for articles about hosta for warm climates and such, I ran across another, also by Tony Avent, which appeared in the AHS Journal back in 1992 (vol 23 #1). I link here to it on the PDN website.
He expresses his thoughts on the way to go if you are going to breed hosta. And he notes that there is no work being done (at that time anyway) on breeding for better flowers. He is concerned about the gene pool for hosta.
So if you are interested in one hybridizer's approach to hosta breeding, and one who has introduced a bunch of very popular hosta, follow the link and enjoy.
Here is a link that might be useful: PDN Tony Avent--Hosta Breeders