So… it looks like the transparency background (the checkboard) is just a loaded image that is tiled. Is there any way we could get that to be editable?
I’d love for users to be able to decide what background mechanism they can use, similar to RV:
IE, checkboard, white, black, 50% grey, 18%, etc.
If I do a url replace on that checkboard png resource it works, so its really just live-adjusting the resource; (there, I de-risked it for ya! 
)
Or even better, is this a feature I don’t actually know about and I’m just missing it?
Cheers,
-Kessler