Hickory: Yeah, well until he/she answers specific questions, who knows what he/she means exactly.
I don't understand what you want to know, but I'm posting screenshots to show you what I have already explained verbally:
Casavir with composite longbow (mighty +3):
https://plus.google.com/photos/113774482362578517236/albums/5968591982284061601/5968591983151430418?pid=5968591983151430418&oid=113774482362578517236 Casavir with regular longbow:
https://plus.google.com/photos/113774482362578517236/albums/5968591982284061601/5968592076838497058?pid=5968592076838497058&oid=113774482362578517236 Notice that the strength bonus applies as 1 1/2 in each case (+4 since Casavir has a natural 16 strength)
Does this answer your question(s) and if not, then please ask something specific.
Thank you,
Tossa
EDIT: FYI, the +2 bludgeoning damage (in the screenshot) is from Grobnar's Inspire Courage ability
MadOverlord: I'm a bit confused, so I'll just throw this out, since I didn't see it mentioned. When you're talking of getting your full strength bonus with ordinary bows, are you possibly thinking of thrown weapons? You do get your strength bonus applied to any of those.
If you had 18 str, with a common shortbow, you'd do 1d6 damage. With a common throwing axe, you should do 1d6+4 damage.
Also, as far as I know, mighty and composite are functionally the same.
The screenshot should clarify that I am indeed talking about bows.
Hickory: Bows do not have a bonus by default, therefore Khelgar should not be getting any strength bonus for plain shortbows. For the Duskwood bow he should be getting +3 for his default 17 STR (mighty only gives up to the character's STR bonus, and no more). Can you elaborate more on what you mean by "It seems that you can get your full strength bonus"?
Khelgar (or Casavir or anyone with a strength bonus) should not be getting any strength bonus for plain shortbows, but in my copy of NWN2, he (and others) does. Again, the screenshot confirms this.