I'm still going to ring so I can book the next 10 days (perk of staying onsite) and the site doesn't let you do that. That could change though so fingers crossed!
But once I'm all booked I can swap and change and add on dining whenever I like up until the week we go. :D So not as much pressure to get the reservations we want first time.
Plus, I finally got hold of my U.S reservation number! I've been trying for weeks to get it with no luck (need it to book ADR's over the phone) so I'm pleased now.