Problem with changing keybinds

[ripe basin]

Sometimes when I build a plane I want to be able to roll with A and D instead of Q and E. I can set A and D as roll but no matter what I can't ever bind E. I cant bind it back to roll. I can't bind E to yaw. I can bind other random keys but never E. Why?

[frigid berry]

I think there was a thread talking about this before but it was never fixed