My guide allowed me to put a deposit down and then follow it up with three payments at 30/60/90 days with the final payment due 90 days after deposit day.
He explained that I would be allowed to rewrite any terms during this time, even switching to a different resort if I changed my mind, or adjusting for better incentives if these come up. I did in fact adjust my contract as a better incentive came along a couple weeks after and he happily adjusted my purchase to include this incentive (it was an extra $1000 off for having a Disney Visa).
It does not change your cancellation policy, which is only ten days, but does allow you extra flexibility on payments and on possible incentives or adjustments.
Bonus, it also allows you to potentially put your payments on three different credit cards and rack up some sign up bonuses along the way, too. There is another thread in this forum about maximizing your direct purchase with credit cards that is worth reading, too.