I'm all for adding anything that adds versatility as long as it stays essentially the same otherwise. Is the side chain available to outside sources in vst2 or vst3? I didn't check as this isn't what I would generally grab for ducking. If so you can work around this with an external side chain.
I'm sure you know all that, but I left the studio and I'm curious now if the side chain input is available to the host. I'll go away now.
JJ