Ghost:
Most of the sounds you mentioned were original or alternate sounds for the Fortress area. They're unused, unfortunately, due to the fact that they're all separated from you when you go to the Fortress. Pretty sure every PC actually has at least one existing Fortress sound already attached to their CRE file, but you never hear it cause you're never with them outside of dialogue or combat at the very end.
So getting those in would require a significant mod designed to -not- separate your party from you when you go to the Fortress. That was clearly the plan at some point. Heck, Morte and Dak'kon even have sounds appropriate to when you meet your own incarnations.
Of the rest:
NAM072: "The damn thing's cursed." - when you equip a cursed item?
Yep. Every
NPC has a sound in a soundset I'm calling "Item cannot be unequipped". That's
TNO's. Most of the others are along the lines of "I won't part with that.".
There's roughly 9 soundsets. 6 of 'em may actually be implementable. Here's the list I gave scient on what I thought would be a good priority list for enabling those soundsets in game:
1. Spell Has Been Warped by Plane (hardly anyone even noticed spells DO get warped, so I think this would be great, my #1 preference)
2. Item cannot be unequipped (trying to unequip cursed items, I agree would be fun. Would never hear Morte's though, heh.)
3. Item cannot be equipped (just trying to equip a "red" item for whatever reason).
4. Locked (this one would be great, heard when you click on a locked container or door.
BG and
BG2 have sounds when you click on those, right? I can't remember but I think so. Right now, in
PS:T, you just get floating text that says "The container is locked." or "The door is locked." or "The door is locked. You will need a key.". Because of that, it will require 3x the engine room that any other soundset does.
5. Spell has been copied. (Eh. Right now it pops up a little box in the inventory screen that says "Spell has been copied!". Add the sounds there? Mebbe. Low priority at least for me though.)
6. Item Identified. (I would consider adding these when you right click an item and it gets identified. However, Morte doesn't have one. The soundfile actually exists, it's just the only one that, when you play it, you hear silence: MRT361. And the sounds we do have for the other PC's aren't particularly interesting. Lowest priority far as I'm concerned. Don't care if it's never implemented. Might wind up just being obnoxious, actually.)
Annah expanded romance mod?
That -would- be cool, but as mentioned, I would implement that as part of a bigger "Party isn't separated from you in the Fortress" mod. Not something I'm really interested in doing without finding some previously undetected largish bit of dialogue in the dialog.tlk for it though

I'm stretching this a bit. 
Heheh... yeah

Not a bad attempt, though... I -was- looking for something to go with that Annah line, and the one you started with -is- better than any I'd thought about.
MRT157: "Annah, would you stop flicking that tail for a few seconds, it's really irritating."
MRT540: "Great. I finally meet a succubus, and she's a puritan." -> Unused
random speech from morte?
Yep. These would work as what are called "Insult From X to Y" sounds. Most PC's already have 'em... Morte's existing Insult to Annah is "You know, it wouldn't hurt you to talk to me, thiefling. Or hug me. Or kiss me." and he has a couple for Grace ("Graaace, I need a sensory touch" and something else).
Not surprisingly, I think Morte is full up

Every slot in the CRE file that can have an insult attached already does so. I'm actually completely stumped as to how those slots work, and how it can tell if the appropriate party member is within the party. A challenge for scient to figure out how that works

And maybe to allow other slots to be used for additional insults... there's plenty to spare, they're just not allocated to that purpose yet.
If we -can't- make more sound slots into "Insult" slots, then we have one other option, which I noted most in Morte's list. Perhaps an "Alt-Sound"
UB component that lets you exchange the sounds you've heard a billion times already for some alternates that weren't. Those two you mentioned, as alternate "Insult" lines to the ones that got used. Here's a few others I'd consider putting into such a component:
Original Morte Bored: MRT042: "Oh come on, let's shake a leg. Well, you shake a leg."
Alternate Morte Bored: MRT041: "*Sigh* It's almost like the master of our destiny got up for some coffee."
Original Morte Rubikon area sound: MRT104: "I... I feel like I'm in a cuckoo clock. A cuckoo cuckoo clock."
Alternate Morte Rubikon area sound: MRT106: "You know, this place looks like Mechanus but it feels all wrong."
Original Morte Insult to Vhailor MRT170: "*Sigh* I think someone needs to oil Vhailor."
Alternate Morte Insult to Vhailor: MRT168: "I'm not saying Vhailor's barmy but his scales just don't balance."
Original
TNO Fortress sound: "This is it."
Alternate
TNO Fortress sound: "So cold here I can feel it." OR "This place stinks of death and shadow."
You get the idea.
Qwinn