You can't climb walls or read languages in BG II - they're just standard attributes that thieves have in the D&D world, and put in there for show, as far as I can tell. So this doesn't mean your thief can read the book of Kaza or any other tome. Therefore it has no effect on your lore score either.
A high set traps percentage doesn't mean your traps do more damage, it means you have a bigger chance of being successful when trying to set one.
As for thief abilities... well, I usually give a thief 100 in pick locks and disarm traps, then go onto distributing points in hide in shadows/move silently, as these skills are essential for backstabbing. Set traps and detect illusion I find less important, but that is just me personally.
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