The way I see the dual-wield + wand thing is that in D:OS 1, it's unlikely that you'll be able to max all five of your starting skills anyway. I think Larian didn't want to make the Inquisitor a class with 5 skill schools, because that would seem unfocused (for good reason). I suppose they COULD have put Willpower in, but hey, they also wanted to show off their fancy new Wands and Dual Wielding, so why not throw those in.
Another point is that in vanilla, you only needed to get two schools up to 4 to get their ultimate close-range spells. (They were Frostbreath for Hydrosophist and Death Punch for Witchcraft.) You didn't need to spend the full 5 points to max a school out.
My EE Inquisitor might get Dual Wielding up to 2 or 3 eventually, but it probably won't be worrying about wand combat much.
I will say that the EE Inquisitor is already a lot easier to get started than it was in vanilla, where you only had Burning Touch until level 4, and some others needed level 7 or higher. From the start of the EE you can get Burning, Shocking and Vampiric touch.
I also would be quite wary of taking Glass Cannon on the Inquisitor, since they are a fairly close range class, and should probably be spending most of their attributes onto INT and SPD. My Inquisitor at level 18 has 21 INT and 19 speed, moves over 7 meters per AP, and can hit enemies with touch range spells from 5 meters away.
I think Shields require STR to use, and if that is the case, then it's not worthwhile enough to bother investing all the STR points you would need to use the decent ones.
