So, a bit bemused about a couple of things:

1. You say you want a 16:9 image for a custom civ, and prefer a 1920x1080 Transparent PNG, but then you scale it to 21:9 I guess if GalCiv IV is running on such a monitor? Any way to fix this? You seem to get it right for the video foregrounds, so I'm confused what you're doing with the images...

2. No way to change the background of a custom civilization? Is this just an odd oversight or some sort of exposure of a game mechanic that I don't understand? It's odd, given that it seems random with whatever you've autogenerated prior to the person customizing the civilization, and just seems like an oversight... But I've read that at one point it WAS possible to change the background, but the buttons were removed?