There's some kind of update (at least - part 1) that you can try...
Fixes:
1) All
BG1 NPCs that had wrong weapons slot selected now have something in their hands to defend themselves.
2) Xzar/Montaron Nashkell related script and dialogs.
3) Kivan's intentions to put revenge on bandits now have some background and consequences - he gives you some time (but IMO far enough unless you'll be tooooooo slow) to find them (as it should be) - dialogues + script.
4) Kagain has his quest fixed now (as far as there're even some corresponding strings in his dialogs that were unused before). It's still very simple but you still have to be a little hurry with it - 1 area+script, 1 new .cre, dialogs and
NPC's script.
Still necessary to modify Kagain's script in a matter of promised payment for each busted bandit. If someone wish to help in this question - one step forward!
5) Simple fix for Alora's dialogues and script.
That's all for now. Not too much though.....