FYI-
MyAcurite now allows for the manual adjustment of elevation data. Latitude, longitude, and time zone can also be tweaked.
As a result, "Adjusted pressure" (i.e. altimeter) can now be fine tuned without the reliance on Google Maps elevation data.
It should also solve the location issue for people in countries outside Acurite's marketing area. I've no idea what that might mean for forecasts, though.
There doesn't appear to be any adjustment for baro sensor bias, but I guess you could tweak that a bit through the elevation setting.