An altimeter is an instrument for determining altitude attained, especially a barometric or radar device used in an aircraft. Seeing that we will soon have access to the whole world, there will be major terrain elevation differences in many parts of the world. The process of using this altimeter would be fairly simple. You would read the meter and find out the airport pressure elevation for that airport, then you would adjust the altimeter accordingly and it would correspond with our altitude indicator.
I think the problem is pilots not knowing how to use it, getting confused and then theirs people asking in support constantly, although it is a good idea for that extra realism.
Yes. This is a big win for me. Being able to select the current pressure setting displayed on the metar would help the use of appraoch plates, situational awarness and also ease the use of airport for patterns