More pressure values for barometric altimeter

[RDN_Garrett]

More pressure values for barometric altimeter please. 
When you put the aircraft at Iraqi airfield H3 in Syria, it is not possible to set the main altimeter as it does not have these pressure values. 
I read Aerges answer that this should be the case, as the Spanish Mirage F1 CE did, but could you make more values for the main baroaltimeter? 
It is now capable of taking values from 930 to 1070 mb, but at the standard pressure of 29.92 in HH at H3 airfield the pressure is about 920-926mb (I can check and clarify if needed)