What problem do you see this solving?
Make the black area outside the image stitch editable, and prevent it from 'bleeding' into ajustments on the actual stitched images. I.E.,when adjusting clarity, contrast, saturation, a halo becomes a huge problem.
Next time, you can just edit your existing post. No need to create a whole new one just to modify it.
In case anyone else is wondering: rewritten per request, but as another post: https://support.captureone.com/hc/en-us/community/posts/14615813764381-Make-black-background-on-panorama-stitches-transparent-editable-when-applying-adjustments
373083490897 Why?
FYI, you aren't going to get much support for your suggestion here unless you elaborate. Why do you need this? What itch does it scratch? How does it help with your workflow? Fill out the rest of that form so we fellow users can maybe toss a little love your way.