Yes, you see your selections, and can adjust your times with some over lap at your 7 day purchase day. For your up to 2 LLSP attractions, you can have more overlap of your LLSP times. Your selections are also held for 5 minutes to allow you to modify your LLMP return times to increase your return time overlaps before you complete the day's purchase.
Not really as the top attractions go first but since you are working with small children you have more options for less popular major LLMP attractions. Is this for day of additional LLMP return times?
When you pre-book at the 7 day mark you will not get down to a 20 min. time between rides.
Yes as I answered above you see the exact times for your initial (3) LLMP and your up to (2) LLSP per day. That was a big downside for
Disney+.
It is workable depending on how busy the park is during pre purchase period for you initital selections at the 7 day, and you odds to improve the more days in advance of your actual park day. Many Guests will try to grab their best selections for a park day for days further into their park days schedule. The earlier you book the best chance to book for a later park day in you visit window.
Dave