Help needed configuring landing mode

I accidentally pressed the X key (the boost key) on my Xbox 360 controller while landing and crashed and burned inside the station. I read that there is a way to configure a different set of controls that function only when landing gear are deployed. Do I need to reassign all my controller keys in the landing mode part of the config file? Or can I just reassign the X key in that mode to something else to prevent me from doing that again?
 
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