ummm... they do NOT get an extra point to weapon skills.
Nephil gets:
2+point to DEX or was it 1 point can't remember
Slith gets:
2+ to STR
1+ to INT
that's it. the missile or Pole weapon extra has to be an invisible stat - because I don't see any other changes after you create a char.
Is it wise to make your mages/priests a slith since they get an extra INT for free? (plus don't have to spend a lot of points in STR) it seems to me after some experimenting that the human mage who is a few levels higher than the slith mage due to teh fact he levels faster is better overall anyway, this makes me think that the ideal character is a human with no abilities (not even the spell improvement trait) since levels are more important than any traits or skills?