Gave it a try. Disappointingly (and confusingly), whilst the auto-levelling is now not toggled by the clicking of the left stick (L3 button), the horn still is.
I tried uninstalling/reinstalling just in case (of something?), and I'm using the Win64 version, but yeah... close but no cigar?
The default is still the same, because I'm using the left stick honking and right stick landing gear function a lot. It's convenient, so your fingers don't have to leave the sticks.