I had made myself a preset and saved it which reverses the Curve (it seems to give exactly the same result as the built in version).
The AI Eraser seems to work very well. It would be really nice if the size of the tool could be altered with a keystroke rather than dragging the slider. Photoshop and Affinity use [ and ] for this.
One more thing I discovered today is that I cannot add tags to a batch of photos, each must be done separately. Having scanned a couple of films I wanted to add camera, film stock, ISO, developer and scanner to each. A laborious business. I tried selecting all from a roll and adding tags to one, but the others did not get tagged. That would be a great time saver.
Chris