By holding down a certain key, e.g. shift, while raising/lowering the end point of an automation curve, the start point of the next pattern’s curve (if there is one) should align (move to the same level) respectively. And vice versa – if you set a curve’s start point, the previous curve’s end point should get the same value. This way you can more easily ensure smooth volume/whatever transitions.
Edit: I reckon this one hasn’t been discussed before.