2. I'm not sure. We always have the
DDP, but have never tried to use on special treats. However, in the past we have had the Dessert Party booked, and most of the treats were included.
3. KtP, there is a fee for 1 year subscription. I've had it for over 4 years. It includes character locator which lets you know exact times, locations of roaming characters. If someone posts here, I include in Post #1. However, info provided only by KtP & his CL isn't posted here by me. He offers touring plans for free with subscription,
MNSSHP is included. I've used one of those customized to my needs and purchased a customized plan to see characters, parades, and fireworks specific to my needs and times. I've always been able to meet all of the characters, see parades, fireworks, and shows with this. However, OP will post there plans here too, may not be what you want to do.
4. It's estimated around 30-35K now.
5. Truly depends on your needs and what you want to accomplish. I've done it in the past when parade viewing was included, IMO worth it then, b/c I could show late/very close to start time (not specified time given) and still enter with credentials and enjoy parade and still maximize party time. Last year, we didn't book party since no parade viewing. 1. Frontierland is great and not as crowded, great place unless you prefer Main St. and if pre-parade party it's only on Main St. 2. Area by trashcans

on Main St. are typically empty and don't have to arrive as early unless large party.
I've been to Sold Out parties, including Halloween, and crowds haven't been an issue. Hub area always crowded. If you have a plan, prioritize, arrive early, you can do a lot. I've met J&S, 7D, Minnie & Daisy, Alice, QoH and Tweedles, parade, fireworks, rides, HP show, all of the Magic Shots and all on Halloween.
Happy planning!