My write-up: http://lilura1.blogspot.com/2017/12/Full-Party-Control-with-Marquee-Selection-is-Where-Its-At.html
Ideally, it would be full party control with marquee selection and strategy cam along with formation-based positioning/movement and companion building and inventory control.
Yea, definitely. The lack of full party control is my biggest disappointment with NWN1, and it's the thing that keeps it from being a near-perfect RPG. I agree with pretty much everything in your write-up, and I especially find Trent Oster's response to be very poor reasoning for not implementing party control. Like you said, even if NWN1 was intended as a primarily multiplayer experience back in 2002, that's definitely not how it turned out, and if they really want to re-release it, they should take that into account. The only thing I disagree with you on is that I'm not at all interested in the so-called "Enhanced Edition". To me, it looks like nothing more than a cash grab.
You also mentioned that you were interested in making a module yourself, but only if party control were implemented, and I can identify with that as well. I've been curious about making a module for a while, but haven't really done much, for the same reason. For one thing, I'd like to make at least one of the companions a pure spellcaster, and pure spellcaster companions are pretty much useless in NWN1 for anything but pre-combat buffs.
Party RPGs can have a lot of cool interactions, but this will not be present if you simple adapt a "single" RPG into a party RPG. You will need to write tons of texts to "simulate" a romance between the MC and a NPC for example. This is why IMHO make a custom campaign in nwn2 will be easier.
I don't know why you think being able to control your companions in battle will suddenly preclude PC/NPC interaction. Perhaps you're assuming that controlling everyone in combat means that your PC will no longer be the main character, and that you won't really get to roleplay as your PC? I don't see that happening. It didn't happen in Baldur's Gate or any of the other games with full party control. Controlling your whole party doesn't mean the game suddenly turns into an RTS or TBS where you're just ordering around a bunch of generic, anonymous units.
Other problem is the permadie. Party members can permanently die in nwn1. So, you will need to give a resurrection rod to PC and if the PC dies, is game over.
How is that any different from what we already have? The way NWN1 is now, PC death is automatic game over, even if they're carrying a resurrection rod or scroll that their companions should be able to pick up and use, or if the companions themselves are carrying such rods or scrolls. If we could control our whole party, we could give resurrection scrolls to each of our companions and have them use one on our PC if they die.