Hi.. not sure I'm following for either question.
Ref Q1. Are you saying that if you click the "+" icon on an automation lane it adds a lane and then closes the current one? If so that is strange behaviour and AFAIK there's no setting that changes that.
If you are referring to editing automation in the main track then you can only have one active envelope at any one time. You need to use lanes for multiple all at once editing.
Ref Q2. Automation lanes should stay open once they have been opened until you explicitly close them. The only thing I can think you mean is how to see several tracks with lanes open at once. If that's the case you need to turn "Auto track zoom" off. (Shift + z).
With that off you can have as many tracks and lanes expanded as you wish. With auto zoom on only the current selected track will display lanes.