I was curious, so I went back in and tested. Nope: moving the left stick up and down moves the taxi up and down, but the auto-levelling only activates if the stick is clicked. I haven't checked to see what, if any, other key activates auto-levelling, but if the clicking of the left stick did nothing at all that would be best (imho). It's the only button on the entire pad that ever gets pressed accidentally.