Aszlari Swordbringer

I was playing BG1 recently (right now, to be exact), and arrived at the Nashkel carnival. As I was de-stonifying Branwen, I was struck with an idea for a mod.

The mod idea is this: All of the NPCs who were in BG1 who are not joinable NPCs in unmodded BG2 (I count the BG2 Tutorial as being part of BG1) should be made available to join the party, with the exception of the ones who fight alongside you in Obe's training center. We know that Xan and Branwen are in the Tutorial, but as far as I am aware, there is no explanation for what happened to them afterward. Nor are there suitable explanations for the disappearances of Shar-Teel, Kagain, Yeslick, Eldoth, Skie, and so forth. It would be particularly interesting to see the changes that would be made to BG2 to have Ajantis joinable in BG2, or everybody's favourite gnome, Tiax.
The second part of the mod would explain (in their biographies?) why such party members as Edwin, Viconia, and the others who are already joinable in both BG1 and BG2 weren't in Irenicus' Dungeon with you.



I'm not particularly coherent right now (night does that to you, unfortunately) and I realize that this is kinda shoddily written (especially for me), so let me know if you need me to put my ideas into clearer terms when I'm more awake.

Is there any resource anywhere that says what happened to the Rakata or the Selkath after the events of Knights of the Old Republic? Or will the fates of these races be explained in The Sith Lords?