@Rogerman8
Hi Roger,
It's been available for a very long time!
In Settings, simply set the desired wind speed unit.
12ADF87B-10FA-42C5-8DEF-739C07C3949B.jpeg
Even more in the browser version, you can change the units directly clicking on it in the colour scale:
C3AECBB5-1F4B-47A8-95FE-6003271B3A2C.jpeg
Same in the mobile app when clicking on the units
F8209CAD-DD7B-46D3-B539-FC2E65F0883C.jpeg
By the way I customized the colour scale for wind in Beaufort steps. At a glance you see what is wind speed expressed in this unit :
https://community.windy.com/topic/7233/wind-colors-for-sailors-and-for-everyone?_=1590219576787