That's a very refreshing attitude. I had heard of Lunar but was reluctant to try it. Lately my policy has been "the less software the better" precisely because of how predatory most software is.
But not your software, it seems!
Your privacy policy has made me think it would be a good idea to try and probably buy your app if it works for me.
This is about a work in progress for a version of rcmd that I intend to distribute outside of App Store. As you guessed, calling private functions is not allowed by the App Store review guidelines.
I want to add hotkeys for creating Stages with the needed windows, because as it is right now, mousing around to move windows is too slow for me.
I'm looking inside SkyLight.framework and WindowManagement.framework to find the right sequence of SLS* or CGS* functions that does what I need.
It’s interesting to see it described as lightweight. I guess every lightweight solution becomes heavy and complex with enough usage.