Ages ago I wrote a Render Effect with MaxScript that replaced any pixel's alpha channel to 0 if it's beneath a certain threshold. To do this, it would go through and analyze the pixels in the frame buffer. Very simple and saved me a ton of post-processing time for some old-school sprite work.
It still works, but Corona uses it's own VFB. How can I get my maxscript to affect the Corona VFB? Is it even possible?