Persistent Imoen from BG1 into BG2 (start of BG2 spoiler)
PugPug
Member Posts: 560
Thieves can use spell scrolls. Maybe she picked up a Scroll of Magic Missile out of the rubble on her way out. There's no plot-related reason she has to be dual classed to a mage at all, and BG2 could certainly use another thief, or at least a thief/mage with usable thieving skills.
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However: Overhaul has confirmed (or as close to confirmed as we're going to get for now) that there'll be at least one new thief in BG2:EE, so all is not lost. It won't be a persistent Imoen though.
But the problem is changing all of that might alter the story slightly which I don't think they can do contractually.
Perhaps somebody can make a MOD though.
Even if you never dual classed her and she starts as a level 1 mage, by the time you get her back in Spellhold, the party will be high enough level that she'll have her thieving abilities back.