What an amazing list. Great stuff and I agree with the majority of it.
I am just downloading it now, but rumor has it that the reason prior saves have been neutered is because they have made changes to the story and dialogue. . .Did you notice. . .anything. . .in the way of improvements?
Just finished the prologue - noticed the following "story" changes:
1) The pod sequence on the ship (the one that changes the redhaired lady into a mindflayer) - the button push area (i.e. the actual 3d model itself) and cinematic associated has been changed.
2) There are new cinematics when you arrive at the bridge. There also seems to be improvements to the "planeshifting" sequence.
The only other big thing I noticed is the UI is different - inventory, character windows etc. Color looks more like the original BG series (brown tone, golden trim lines, and an "older" design). Some pieces (i.e. character sheet) have been rearranged and the filter options are more obvious. Character sheets have more info but unfortunately I still can't seem to find my saving throw values - still needs work IMO.