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I read that there is a feature called Improved Critical.
>>Benefit: When using the weapon the character selected, the character's threat range is doubled.
Special: The character can gain this feat multiple times. The effects do not stack. Each time the character takes the feat, it applies to a new weapon.
Note: "Keen" magic weapons also double their normal, nonmagical threat range. As with all doubled doublings, the result is triple.
<<

Well I found out that it increases the dice range for criticals, so a weapon that only crits at 20 would crit at 19 and 20.
But I dont know what happens to a 19-20 or a 18-20 weapon.

17-20 and 15-20 respectively

Wow

Have you tested that ?
I was a bit confused because of the Keen weapon part.
What are Keen weapons in NWN ?

keen weapons also double the critical threat range, but it says in the player's handbook for 3E rules that a doubled double is a triple (in other cases besides this as well) - so if you have a weapon that normally criticals on a 19 or 20 like a longsword, and it is a keen weapon it will critical on a 17,18,19.or 20. If it is keen AND you have the improved critical feat in that weapon, it will critical on 15,16,17,18,19, or 20.....which is actually pretty good Of course there are some creatures like undead which are immune to critical hits so it is only good in some situations.