Hello there,
This is more a suggestion rather than a request for support.
We used to have an add-on for Visual Composer called Ultimate Addons for Visual Composer.
This add-on enabled a set of great features to manage sections background, parallax, multi-layers parallax, gradient overlay, etc.
One feature that we have been used to is the “Scroll effect”.
Options to set whether a background image is fixed or scroll with the rest of the page.
You can set this to “Move with the content” or “Fixed at its position”. The latter would help a few users which I have seen have opened support tickets to set a fixed background image for a section.
Another option that’s rather useful is the “Parallax Speed”, allowing us to…
Control speed of parallax. Enter value between 1 to 100 (Default 30)
This would allow us to have a more granular control over how the parallax behave.
Hope this can be considered!