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Regards
OK, not "must", but "should".
Compressed images are great - they allow direct use without extracting to temp folder, not like RAR or 7z. And it would be very great if ImgBurn supported at least one compressed format. And if it does, it has to be ISZ.
Also from a programmer's point of view, ISZ is very simple to implement, both read and write (without encryption support, which we don't need anyway).
And I don't get it, why ImgBurn has vast compressed audio support (FLAC, APE, WV), but not general compressed data.