dying_inside,
I just had another thorough read through the settings, so it's still fresh in memory. I won't quote what you said, so my reply doesn't become unbearably long but I'll respond to what you mentioned in pretty much the same sequence as your post.
It looks like the races might initially spawn in their major settlements, where majority of their race is. But perhaps, there'll be some sort of "safe points" implemented (which would be nice), so that you can choose where your default spawn is after you die and get out of the Death Realm. Also, it's possible that DR will simply have different portals that lead to different spawn points.
I know it's kind of strange if you selected that you grew up in some other race's village but spawn in your own, so I don't know if those character creation choices will ever affect your initial spawn. But I don't think a spawn point should be tied up to your race. It's possible that many things will affect it.
Also, when you start the game, you're not really born. You're already supposed to be some kind of adult, whether young or old. Otherwise, you'd have to start as an infant in your parents' cradle. So, I don't think that Kran will be crawling their way out from the rocks like zombies.
I don't think that the Bronze Doors region is Talad's temple. I found an older post where Alex "Inca" confirmed that Talad's temple is exactly what you see in his concept art, which is labeled "Kran temple".
The Kadaikos is the place outside of Yliakum stalactite, inside the actual cave that the stalactite itself is located in. As far as I understand it, there are three types of Lemurs in PlaneShift:
- Lemurs that were originally created in Yliakum and stayed there
- Lemurs that traveled with Laanx to an area that later became Kadaikos
- Lemurs that followed Laanx back from Kadaikos to Yliakum when she/he left.
So, I suspect that the Yliakum Lemurs would be located on the first level, since it's closer to Laanx temple, and majority of them are likely to follow her. On the other hand, Lemurs that follow Black Flame are for the most part located in Kadaikos. It is possible in the future that if you pick to follow Black Flame as a Lemur, you might spawn in Kadaikos, and if you pick Laanx, you'll spawn in Yliakum. Unless, of course, the Lemur players are only meant to see the Yliakum point of view and later discover their distant Kadaikos ties.
I see the humans (Ylians) pretty much being on the first level because according to history, they "hogged" a good potion of the first level, even pushing out Enkidukai, due to being able to create a lot of farms. And they certainly don't want to give up that source of food.
The Enkidukai came through the first portal with Ylians, as for as I know, and both tried to settle on the first level, with Enkidukai being somewhat pushed away by Ylians into a different area of the first level.
The Dermorians, I'm not sure. They are a nomadic race, so I don't think they'd stay in labyrinths forever, and most likely explore and eventually find various Yliakum levels.
I don't think Xacha were nearly extinct because they lived underground. They were nearly extinct because of the overpopulation of their peninsula. They just came to "die" underground, as some kind of final resting place but found a new beginning. What is not quite clear is whether Xacha were native to the planet or came through a portal and only then noticed by the dwarves. If not, then their original city is somewhere on the same planet.
I also don't think that dwarves hate Xacha. Xacha aren't weak by nature, they simply faced an overpopulation problem. So, I wouldn't automatically assume that they and dwarves dislike each other.
As for Xacha's spawn, I suspect the first level as well, since a lot of them (but not all) follow Laanx, and Laanx temple is on the first level. The secret Xacha sect too may spawn on the first level because the Windowless Tower is also on it.
It says that Diaboli came through a second portal located inside the stone labyrinths. It also says that they don't care about the concept of other peoples' ownership, so I suspect they'd try to settle where they felt most comfortable, whatever that place may be. But probably as far as possible from Talad's temple.

I'm not sure where Klyros would spawn but certainly not in stone labyrinths. Not sure about Ynnwnn either.
Also, I don't think that any race will spawn near any portals. Aren't we supposed to see the game from a perspective of inhabitants that are several generations and years past their original ancestors?
It's possible that the same race might have settlements on more than a single level.
Just some thoughts.