I never dual classed her in BG1 and I would never have even thought of it...
By the time I had reached "Tales of the Sword Coast" She was a Trap finding, Lock picking, Back Stabbing Goddess!!
Then I bought BG2 and the rest is history....
With so many good magicusers in the game why da hell did they have to screw Imoen up and why the new ugly picture? (whats up with all the piercings on all the NPC pictures BTW???)
Its all a load of BS if you ask me. I would never of thought of leaving her behind in BG1 but in BG2 she is nothing worth your while and more of a burden as an asset
.....just my 2 cents.