Thank u. Really I suggested a very basic thing actually.
I don't ask Wes makes new mods concerning new NPC quests. If somebody want them they are free to do whatever they want.
I just ask this and if it is feasible:
Eldoth, Skie, Alora, Xan, Branwen, Yeslick and Kagain can be found in alternative cages in pairs. But no Jaheira or Minsc. If we chose an alternative starting package that is.
It sounds like this would make a reasonable mod project.
My suggestion would be to do something like this.
Create Eldoth, Skie, Alora, Xan, Branwen, Yeslick and Kagain as starting NPC's, just as you would for any other custom NPC project. This includes level-up files, soundsets, etc.
Use appropriate editing tools to find where Jaheira and Minsc start out (the exact coordinates).
Create your mod so that it immediately triggers after the end of the first movie narration (during the bit where Imoen usually comes in and lets you out of the cage).
Here's the tricky part. You have to figure out 'how' to get the appropriate folks into the cages. Either you could have a message box pop up before Imoen speaks to you asking which folks you want in the cages (in an "Out of Character" way), or, you could make it a smoother, more in-game option, and you could exchange conversation with Imoen which sets the people (something like "Heya -- who do you see in that cage just north of us ...<person 1> <person 2> <person 3>".
Having set who's supposed to be in the cages, you teleport Khalid and Jaheira out, and teleport the appropriate people in. Set Khalid and Jaheira to be find-able somewhere else (perhaps right outside of the dungeon after the movie where Imoen is taken off by the wizards), and write in nice little reunion dialogues that link back the conversations that used to happen when they were in the cages (taking out the bit where you're being harped at to get them out of the cages).
One issue to keep in mind is that Minsc's cage doesn't have a key, so, you'd have to provide an alternate in-game way to escape it. (Maybe you could trigger the same effect that simulates his rage breaking the bars, if the PC is carrying the key to Jaheira's cage).
So, it does sound feasible to me, as long as you (or another interested person) knows enough about modding or is willing to learn it, well enough to insert a new NPC into the game. I think the most work would be setting up the NPC's to be inserted (with their sound-sets, greet/join/leave files, level-up files, etc).
Someone else who knows about modding is free to correct me if I'm wrong, of course, but, it sounds very "do-able" to me, as a BGII mod.