Jeff, You can buy the seat extenders from FireBirdBill , earlybrds@aol.com , they will let you push back another 2" , (he reproduces the factory option)....tell him Bjorn sent ya!
re: the 'lean' on the seats , I am not sure ,but cant you adjust it by turning the screws that are the 'stops' for the bacck rest?
I havent tried mine siince they are in correct position for me....
but I did buy the extenders, I am only 5' 8" , but I really liked the extra 1" that I use , to get arms right ,legs straight...