1. I'm a little confused about this. If you feel like scenes are too short, wouldn't skipping them make them even shorter? To your second point though, in the coming update you will be able to interject when a scene is ending to fix the model ending the timeslot too quickly.
2. Tomorrow's update is all about control. While it won't have an arousal meter, you'll be able to edit responses and insert an action whenever you want for more fine-tuned pacing in an NSFW scene. Stay tuned!
3. All the backgrounds are pre-genned, but allowing the user to upload custom backgrounds would be very doable and it would be easy to give the AI access to them to set automatically. Highly considering this, thank you!