We encourage you to check out the dev updates on our other pages to see all of the work going into the game that hasn't made it into the test releases yet (they are free on our Fantia page right now).
We've very consistently added new H content and fixed hundreds of bugs during this time span, and you're correct that the edge screen issues are important and needed addressing, especially with newer scenes that require more screen space. Due to feedback like yours we increased priority on that.
We've constructed a tool that calculates the boundaries of scenes (all of them are unique) and places the scene appropriately based on proximity to the map edges, dynamic screen edge colliders, and obstructions. It will also allow bystanders to position themselves out of the way if a scene requires more space. We've also begun looking at ways to transplant the functions of our gallery camera into the in-game H scene camera (allowing for on-demand panning while still functioning with the unique stage boundaries each map has).
Regarding the FK-Doll Wall Train scene, this is by design and what you're expecting will be related to the cinematic mode feature, which will allow for swapping to a 3D view of the scene.
Please remember the game is in-development and only make a purchase if you want to support development. Don't expect a finished product yet or a completely new experience every release. The goal of these releases is to show consistent progress and provide an avenue for people to support the project without using a subscription site (many people are uncomfortable with these or are simply unable to use them due to location).