Ideally I want to be able to add different comments to each jpg, but do
it in a way which minimises keystrokes, for example, do something like
hit F5 and it takes me to the next EXIF comment field on the next jpg in
the directory. Then for example, I hit another key and it adds a
customisable string like someone's name. So if similar people are in
each photo I can just hit he shortcut key for each name and it inserts
the full name into the field.
It would be good if when you were using a program like irfanview, it
displayed a set field at the bottom that you could quickly add comments
in while going through your photos.