WeatherCat Version 4.0.0 dev release #9 is now available for testing. See https://athena.trixology.com/index.php?topic=3696.0 for more details and download.
For a Vantage/Vue/Envoy, open the station hardware options from the Tools menu, then hit the 'Set Channel Names' button at the bottom to edit the names. You'll have to reboot WeatherCat after making the changes you want.