Is the Decision Height (Baro/Rad) setting simulated? I mean does that change at the different Airports? Or is the setting (Baro1013) the same every where?

Decision Height
-
-
DH and MDA settings are simulated, yes.
The barometric altimeter setting is simulated as well but for now the QNH is constant at 1013 hPa or 29.92 inHg
-
It would be nice if the QNH were simulated at the respective Airports. I know that the air pressure can change in Real,but not the altitude of the respective Airports.
-
Locally different pressure would require settings to modify these values, or a model which updates pressure on its own.
This in turn would require a map / weather chart / radio channel which tells you were to expect which pressure.
Back when the Wettergerät was build there was no accessible setting for barometric pressure whatsoever (as the Wettergerät searches the main configuration file).