My dream features include a couple of items related to processing scanned negatives:
1. An Invert button. Currently I have to manually invert the curve. (I do use the ColorPerfect plug-in for colour negatives, but for B&W an invert button would suffice.)
2. A retouch module for spotting out dust specks or scratches. Currently I have to make a copy and edit it in Affinity Photo to do this.