(i) Beats me too, it's not present in US 7x5 fw at all, and only appeared in mine running SG with locale to AU [and US also i think]. In some other units, there's one called 'Exit Services' which will list the up-coming exits nearby Gas Stations etc., maybe it's the same sort of thing.
(ii) I'm sure your assumption is correct that any Garmin online services have been discontinued.
(iii) No, not in 765. Possible in some far more recent units to change Country thru hidden menu behind speedo though.