Hi and thanks for your question. First of all, it's completely irrelevant to the question whether you're using Pro, Lite, or one of the two on a friends' iPad with no intention to buy, ever. Pro and Lite are the same except for the Lite Bar. The support is the same too, whether you're Richie Hawtin, totally unknown, or somewhere in between.
Find out more about the differences between Pro and Lite
Thanks for your question about the QuNexus. It's not currently possible, but it's an awesome suggestion. I'm switching this to suggestions, and hoping you'll continue to use MIDI Designer Lite in whatever capacity it's useful!
Thanks!
Dan