You cannot cast Time Stop in BG2:SoA, as weird as it is. Then perhaps it isn't weird, since you can see from your spellbooks since BG1 that there are 7 levels of priest type spells and 9 levels of wizard type, yet in BG1 you were capped at even much lower levels. Which is pretty stupid, why to even add the damn pages and such then. I know that when BG2 finally came out, after the years, I thought that "OK, now I then can cast all these neat spells". Well heck no, I still cannot. Not all..
You can however cast these spells when you have BG2: ToB installed. At least there you are not messed up like this anymore. Time Stop and so on, the neatness and dream of a casters. Or something.
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