I've got to admit - dual wield is so powerful, that Larian should probably consider seriously nerfing its next game/ruleset.

I recently noticed that +damage enchants affect both weapons if you're dual-wielding. For example: a +100 damage enchant on two (dual wield) weapons will give you +200 damage on EACH weapon, or +400 damage total across both weapons (not counting dual-wield skill penalties or bonuses). This means you get twice as much 'value' out of your damage enchants if you dual-wield (compared to using a single weapon).

Plus, if you weren't dual-wielding in the first place, you'd only be able to cast a single +100 damage enchant anyway... +100 vs. +400 - I wander which one I'd choose?