I am new to this forum, I was following the development of FreeCAD for a year or two. Now (...and in future) I want to contribute!
This is a (probably) a small feature request, here is the problem and my "workaround":
Importing an Image (for example for tracing) results in opaque image plane, looking from the rear it is almost black (see image below)
I figured out, one can customize the Material properties (three dot button) and set them all to white and shininess to zero percent.
Now the image is visible from the rear (helps a lot, if one is sketching from that view).
Slight transparency may improve usability (this one is maybe too trasparent):
My suggestion: Set the material (colour and transparency) properties for the image planes on creating/importing the image. If this is too difficult, maybe create the "plain white material" to select from the drop-down-list.
Also, a nice addition would be to save the user defined materials to the list.
Looking forward to your comments!