| There's no reason why you need to add a fighter type. Jaheira with Ironskins and Haer'Dalis with Stoneskin, Tenser's, and Offensive Spin, are more than capable of chunking enemies. Be sure to equip Haer'Dalis's Chaos Blade in his main hand, for those enemies not requiring +3 or better to hit, since the dex drain can kill enemies.
All thieves get 5x backstab at 13th level. If you dual at this point, it will take a while before you recover your thieving abilities, but you can use the XP earned from scribing spells to help with that. As an assassin, you'll probably want to dual this late anyway, and you'll still be able to max out your mage class in SoA. An assassin-mage can poison his MMM's (and the energy blades in ToB), so he has the potential to do a lot of damage. Have him cast Tenser's for backstabbing fun.
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There's nothing a little poison couldn't cure... What happened here was the gradual habituation of the people, ... to receiving decisions deliberated in secret; to believing that the situation was so complicated that the government had to act on information which the people could not understand, or so dangerous that, even if he people could understand it, it could not be released because of national security. | 
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