AFAIK there is no way to enable any kind of area for the 3ds Max lights, so I would bet this is not possible. Anyway, caustics in Corona are still WIP, but they will be done at some point. Currently you can use the experimental Bidir/VCM engines to render caustics, although this comes with some limitations, so it usually pays off to fake them in some way. See:
as 3dsmax lights are very un-physical, I doubt they will ever work reasonably with caustics in Corona. But we will try to make the Corona Lights work some day…