I have mentioned this before but I would like to add a new request for it, because I think it could be really useful and I miss the possibility so often.
The Corona Volume material is great, but very often when you want to use it for such things like ground fog or dust with a certain height or areas (not only full screen fog) the edges becomes to hard. and increasing the absorption distance only make the volume less opaque, but the fade to the edge of the volume stays the same. It would be very useful if you could control the feathering towards the boundaries.
See image example.