I would ask if is possible add a way to delete acquired frame during the plan execution instead have to explore the folder, find the frame and delete it.
Atually I am doing it by using an external fits viewer that was able to explore the folder with the arrows key github.com/dokeeffe/yaffv
I think I'd rather a separate tool be responsible for deleting FITS files. I'm not sure that's something I'd want included in the FITS Viewer. With it being called the FITS Viewer, I'd assume it couldn't do anything destructive to the file (or modify it at all).
I have often hoped I could delete a file from the FITSviewer. Usually it is an airplane or a bright satellite that ruins a frame. A quick delete with an "are you sure" prompt would be welcome.