A

Alderamin

She announced her retiremement but there were still scenes in the pipeline after her announcement. There was a new scene on Fanza a couple days ago. From what I gathered, she actually retires on August 16th for her 30th birthday.
Also I'm pretty sure she's exclusive to S1 and doesn't film with other studios.

That sounds great!
Maybe related to 4. you could add a button to skip to the next scripted part, to easily skip over unscripted portions of videos (when there is no action) and directy go a couple seconds before the next scripted section.