Would it be possible to get a colour selector for the material editor viewport background? This would be super-useful for Translucent materials to see how they look against all different kinds of background.
Bonus points available for allowing us too use that colour as the backdrop in the thumbnail preview too 
I quite miss having a black backdrop behind translucent materials in UE3, you could see things at a quick glance without reading all the names and opening up each material to check it’s the right one.
Thanks