Right now, synced split window allows for synchronized browsing and zooming accross the two panes, but not deleting.
A synchronized deletion option would be useful. Sometimes I browse simultaneously two folders, one with original versions of pictures, the second with edited versions. When I come accross a shot I want to delete, I usually want to delete it in both directories. A shortcut to easily do that would be great.
I think it hasn't probably been implemented for security reasons, to prevent accidental deletion, but I think that could be prevented by mapping synced deletion to a keyboard shortcut that can not be hit by accident (like , , or something like that).