For point 2, we only do it once when configuring the plane.
For point 1, it all depends on how you use the parking editor.
Each flight, I only configure the 2 ramps that interest me for the departure and arrival of my flight and I have to select "Disable staircases" the first time.
And if I come back another time to these 2 ramps, it will already be done.
If you use the multiple selection of ramps or gates/... , once selected and without forgetting "apply", it is done for all ramps of this airport.