LUT organization : yes this is something I need to add
Fringe control (green and purple) will be in the next release of the app
Edit In External App is already present. Pick an image and go to the Image menu.
Copy/Paste works by copying any adjustment that has the check-mark next to it. So, in lieu of a UI for copying things, you can briefly uncheck the ones you don’t want before copying.
Other things are mostly on the list to do at some point (except vignette shapes – that is not something I have considered).
There are many sharpeners in the app. Clarity is a type of unsharp mask.