Actually, if we can get that rolling what I'd personally really appreciate is a DR solution that works with the IR. I know, I know, it would be less interactive than one would expect but trying out other solutions and how they do IR + DR I think it is something I'd really appreciate having in Corona.
Say for example you are running a 3k preview in the IR (4k screens!), working on those details and sure, you need to wait 5 seconds for the new passes to start coming in from the slaves but once they do... It really speeds up the rendering process because even with the network lag if the initial rendering time was 15 seconds and you get lots of passes coming in after 5 seconds already... You can perhaps cut the waiting time in half.
I'm still kind of thinking that would be super useful. Especially so if you like to have caustics and what not turned on.