Add a emergency and disaster layer, like RSOE EDIS

a Flight Tracker like Flightradar24, also a interesting thing for add on Windy

I have other feature to suggest, support for different map projections, Windy use Mercator projection, but there exist others more useful for studies and etc...

some info.
https://en.wikipedia.org/wiki/Map_projection
https://en.wikipedia.org/wiki/List_of_map_projections

this site is a tool for see distortions on the Mercator projection.
https://thetruesize.com/