XnView Software

- (...) Ctrl+Tab should cycle through the tabs, (...)
- No fields except the Write button have an associated keyboard command.
- The Write button acts like an "Apply" button; (...)

I cast my vote for the IPTC editor enhancements discussed in this thread. Since entering metadata takes some typing ...

Suggestion: Add the option to select the character encoding set for the IPTC data both for reading and writing.

I second this suggestion - just see what the default behaviour does when an image with IPTC is put to an online album. I'd further suggest that the default encoding is set to UTF-8 ...