Thanks, Baymax. I often used to tweak the FPs when we were there so I guess I'll have to get used to doing it this way, rather than all in advance. I'll still be able to get the important ones, like Mine Train, booked.
Dog, I booked my ADRs whilst logged into MDE and I had to choose the people who would eat there, from my Family & Friends list - so it knows who is an adult and who is a child. But yes, I'm sure it won't matter at all.