I've taken to adding a few custom button mappings to make common tasks easier. I'm only adding things slowly to ensure that I really do use them once I add them. But here's what I have so far:
This is also to make it easier for me to remap things if the button mappings get wiped for whatever reason as happened in a recent bug in the Xbox One version of the game.
Someone on /r/EliteOne suggested these controller mappings as what they use because they fly model helicopters: