The documentation I am reading here about triggers shows commands for 3 triggers -- A, B, and C -- with On and Off commands for each. I assume that is what you are seeing as a Zone 2 trigger (perhaps other receiver models have more triggers).
I can add that action in to the plugin, but will be up to you to test it out and see how it works as I either don't have it, don't know about it or at the least don't use it! I'll let you know when a test version is available to try out.
Adam