Ammunition for ranged weapons. - Just for special ammo, normal ammo should be ilimited
Weight carry capacity on per-party member basis. - no, I like the POE system with the endless stash
The ability to add map notes when in the area map. - that is a good idea
The ability to split the party between non-party-required areas (there was a technical limitation to that) with some party members being in one area and others continuing alone in another. Even better if certain quests require that. - not for or against this one
Separating stealth from trap-detecting mode. - YES!
Modding Tools so people can make their own adventure modules and create campaigns, this is one of the reasons i liked Neverwinter Nights 1 despite its generic main campaign, the player modules(Like Aielund Saga......) is what kept me buying the expensions and play the game even today.