One more thing request -" continuous scrolling image". It is ok in Grip Pro theme currently, but not running smoothly. I want someone can fix it. May be create a new module. 
Are the two images not following each other smoothly? maybe the two images being on separate animation causing issue? If so, you could try the following:
Create an image.
Duplicate it.
Create a surface twice the width of viewable width and place both images on surface to cover area.
Animate surface to slide only half width and loop.
If it's a different issue, try and explain?
No, it does not related of "following each other" issue. Please see as below video.
1. When I don't press any button, scrolling is running fine
2. When I press direction button, you may see appear "frame drop"
3 When I long press direction right button, "frame drop" is obvious
https://youtu.be/Omfdk6e6BasActually, I don't know reason. But I think it is current handle signal issue. When I press direction button, it will triggle all animation process (including BG scrolling).
The ideal BG scrolling modules should be load in cache and then running on BG. It will not be affected by any input.
Sorry, my English doesn't good enough. Hope you can understand.
