Not that this matters, but when we switched to Corona we basically said at the studio we will only treat Corona using Path Tracing + Path Tracing and just pretend that Cache options just don't exists. I find that Corona is just fast enough that we dont look back. I hated dealing with animations and Cache in Vray, so when we came to Corona we just pretended like it was not there haha :)
Good luck on your project.
Dave