How to level up Imoen

So, not exactly a new player. I played this game 10 years ago, but I notice that I'm rusty these days with old D&D rulesets. I play 4th edition nowadays.
Regardless, how would you level up Imoen? Should I dual-class her? What do you recommend?
How is dual-classing in general? In what situations is it worth it?
Regardless, how would you level up Imoen? Should I dual-class her? What do you recommend?
How is dual-classing in general? In what situations is it worth it?
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Literally a third of the game's NPCs have thief levels of some kind so that's easy to replace. She's the only potential mage in the game with max dexterity, and is significantly more durable than any other mage candidate as she has those thief levels for extra HP + 16 constitution.
It does mean you'll have to sacrifice eventually being good at sneaking. Luckily, mages get invisibility so who cares. Rank up find traps and open lock to around 85 or 90 apiece and you're good to go. Just make sure you pick up a thief to cover your trap finding needs in the meantime. Coran joins roughly the same time I hit level 6 or 7 on Imoen anyway, so he's the obvious candidate.