Thanks for your kind words.
Assuming that your use of the Facebook-v4 plugin doesn’t stray too far from the functionality provided in our Facebook sample, you should be ok to use it in production. The things you asked about initially were added to the plugin more recently, so they haven’t been exercised as much as things like login, graph API requests, and the Share dialog.
Should critical issues be found along the way, they’ll be prioritized as high as it makes sense at the time. It really depends on what we’re currently working on, but this is the case with all bugs. Usually if something is totally busted and everyone needs it right now, then it’s safe to assume it’ll be the highest (if not close to the highest) on our priority list.
You’re definitely welcome to implement Facebook App Invites yourself with Enterprise. Should that process move along smoothly, we can talk about integrating your App Invite implementation into Facebook-v4 directly, as I’m sure the community would appreciate that feature sooner rather than later.
Supporting multi-dex in Corona SDK builds has also been an on/off process. It’s in the queue of Android tasks and it’s at least been started. But as I mentioned before, Android 6 has been the main focus for the Android platform.
Since you’re using Enterprise, there are a few forum threads about customers doing multi-dex that may be worth investigating.