Let's talk about making Icewind Dale II - Unfinished Business

1) What unused areas could exist in the data?
2) Any broken quest lines?
3) Broken characters?
4) Lost spells?
5) Lost items?
6) Lost creatures?

Far as I know there is no UB for IWD2 yet, and I'm wondering could possibly be in the data, someone on SHS referenced there is unused areas a decade ago, but I don't know how accurate that statement is. Also if for some reason Beamdog does decide to enhance it (which I don't think it is likely) then anything listed here by the community would be very beneficial.

EDIT:

Looks like I was wrong, there is this modification done by Almateria called IWD2 Fixpack, but could be anything more left to fix in Icewind Dale 2 besides what she found? Anything the modding community missed?