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AlanHK - ask Irfan Skiljan to put in a fourth option to overwrite with same name with an option to save original elsewhere.
He did a couple of similar changes for me a few years back - i.e. additional options, for existing features.
'Bout time we had a new IV release
Meantime when you need to use the Lossless plugin,
- right click image Book Browser,
- select Save as, <whatever>.jpeg to let's say Desktop
- edit it there with IrfanView,
- save it (the original will be renamed as <filename>_org.jpeg),
- add <whatever>.jpeg back into Sigil via right click-on image folder, you can overrwrite existing <whatever>.jpeg
Or here's a list of programs that do lossless crop and rotate ==>>
http://jpegclub.org/losslessapps.html
I would guess they all use jpegtran
BR