Just a few things I was wondering about, hopefully someone can answer them for me...

1. Does crippling strike stack? To what extent?
2. Does called shot stack? To what extent?
(most importantly here, I'm wondering if the -20% movement speed stacks or not.. dex would also be nice to know about)
3. Can you KD as an archer? (dumb question I'm guessing, but doesn't hurt to ask.. could be glitchy for all I know)
4. Can you use rapid shot in conjunction with called shot?
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Have I mentioned I hate IGMS? I could very easily be wrong:

1. I do not think it stack. You could make a Mod with an NPC who has an insane AB and just stand there letting it sneak you over and over so you can test this for yourself, but I do not think that it does.

2. Called Shot does stack, but it does not last long enough for it to really make a huge diffrence (it lasts a few rounds at best). All aspects of it stack.

3. Archers tend to be very easy to Knock Down (I assume KD is Knock Down). The DC on Knockdown goes against one's Discipline check, which is a Strength Based Skill. And unless you Multi-Class your Rogue to have something that gets Discipline, you will be an easy target to being Knocked Down.

4. You can use Rapid Shot and Called Shot together, but you will get a large negative modifier towards yout attack bonus. You go into the combat style of Rapid Shot (which, you can only be in one combat style at a time), then you go use the technic of Called Shot (You can only use one technic at a time).
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Click Here for a Guide to Neverwinter Nights. I believe he was asking if it is possible to use the knockdown feat with an archer. I'm not sure if it is possible to knock someone down with a ranged weapon but I'm thinking that it doesn't work. 1. It does.
2. It does.
3. You cannot.
4. You can.