Quick and hopefully simple request:
My workflow is typically to tonemap during set-up, and then render to linear OpenEXR. I have a tonemapping gizmo that I made for Nuke (it's posted somewhere on these forums) that supports a bunch of different operators, including Corona's own. It'd be nice if I could view the render inside Corona's framebuffer with tonemapping applied, and then save out a linear image. I did make a detonemapper that removes applied tonemapping as well, but it's kind of tricky and I haven't been able to make it work for arbitrary input parameters.