You can't change your alignment on the lawful-chaotic scale in NWN, but you can in SoU and HotU. I don't remember exactly, but I don't think that the alignments shifts in each individual case is very big, so you should be able to keep a lawful alignment in both of the expansions.
As for Tomi and traps, I believe there is a disable trap command in his radial meny.
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Nothing is impossible, it's just a matter of probability.
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