Am I the only one who's not going nuts over this? Don't get me wrong, it's great the 1.10 Shadows can finally rival the Valkyries, but it's no fun letting minions do the killing for you. If you're able to get more than 15-odd +skills(which may be a problem for one who hasn't got access to top-end gear. With two +3 Trap claws, a +3 Ammy, +2 helm, +1 armor and two +1 rings would only net you 14, which is about as high as a casual player would usually get), you might able to get your Shadow do more damage than your own Traps, if you can manage to convince it's fickle AI to actually sit still and get to Trapping without charging into melee(then getting ripped apart, and forcing you to make it re-learn all its synergies) or throw FBs sporadically.
Getting a melee version of an Shadow sounds like a better idea, but without some very careful babysitting, she's might get killed repeatly by Gloams, IM, or mobs of Frenzytaurs/Serpent Magi/OK/that freaking Fanaticsm Extra Fast Extra Strong Flayer pack. There are simply too many dangers for an unsuspecting Shadow in the Worldstone Keep, IMO.
However, Shadows might have trouble dealing damage in melee as well. That 300-odd STR/DEX sounds mighty tasty for Kicks, but I'm having doubts about a lack of boots on Shadows(unless there's a different Kick damage formula for Shadows).
Besides that, there's no guarrantee that the Shadow will charge 3 TS before releasing DTail(or worse still, release those TS charges with her piddy Normal Attack).
PS also seems like an option, but like another poster pointed out, there's no guarantee that your SM will release the charge whose synergy you've maxed out.
The Trap/Melee suggestion brought up by Jrichard sounds best(I would go with 20 DTalon instead of DTail, though), IMO. After max SWarrior and the 1 point wonders, you have 64 points left (assuming slvl 85 character with the 12 skillpoints), leaving 44 for your Traps(20 goes into an MA skill). On yourself(with +12 Traps, and +13 SW), that means 1-2955 LS damage. On your SWarrior, that means 1-4490, which seems pretty decent IMO for supplementary damage.
However, the inherent AI factor with Shadows remains....if she decides to be a bit brave and follow your lead(go into melee), she might go down/deal no damage.
I know I'm probably being unduly pessimistic about the capabillities of Shadows, but it's just my cynical two cents on the topic.