Background image (when as foreground) opacity slider

[marksmanguy]

First off, thanks so much for adding the slider for the LUT, and being able to save. I would love it if you could add an opacity slider to the background image (for the foreground). It would so useful when tracing or using an image as a guide, and not having to keep ticking on and off the background toggle, or adding opacity to the material.

Would really appreciate this one.

Thanks!