You’re not the first to request it! Since xtb calculates them regardless it’d be fairly easy to support them. @ghutchis – is it possible to pass them to Avogadro in the CJSON, and if so with what syntax?
Yes, the plugin also acts as an interface to CREST, but sadly they only make binaries available for Linux. I’m not sure it’s even possible to compile it yourself on Windows.