Small bug:
"Options -> Default Structure Display -> Edit" isn't respected when editing locations on WMP files. They always open in View mode.
I haven't noticed anything unusual. Can you provide a repro?
Sure.
Open NI, make BG:EE your active game.
Top Menu: Options -> Default Structure Display -> Edit
Resource Tree: WMP -> WORLDMAP.WMP, select View tab
In the Areas panel on the right hand side of newly visible worldmap, double click any area
Note that the area opens in View mode, rather than edit.
Likely an Area opened this way does not conform strictly to a Structure, thus the default structure display isn't acting on its default display mode. Still, I think a reasonable expectation is that areas opened as such follow the convention set by Default Structure Display.