nin/nin build for duo with dom

Hi all. I am starting a duo with my wife, who is playing the stalker. We each have lvl 50's, but have never played stalker/dom before. Her stalker is lvl 12 and my dom (mind/psi) is lvl 13. It seems like it will have good synergy, I'll sleep/dominate/confuse the mobs and she'll take them out 1 by 1.

Never having played these AT's before, I'm looking for tactics and build advice. Here is her current build:

Villain Plan by Mids' Villain Designer 1.601
http://www.cohplanner.com/

Click this DataLink to open the build!

Lady Cena: Level 11 Magic Stalker
Primary Power Set: Ninja Blade
Secondary Power Set: Ninjitsu

Villain Profile:
Level 1: Sting of the Wasp -- Empty(A), Empty(3), Empty(3)
Level 1: Hide -- Empty(A)
Level 2: Flashing Steel -- Empty(A), Empty(5), Empty(5)
Level 4: Ninja Reflexes -- Empty(A), Empty(7)
Level 6: Assassin's Blade -- Empty(A), Empty(7), Empty(9), Empty(11)
Level 8: Build Up -- Empty(A), Empty(9)
Level 10: Danger Sense -- Empty(A), Empty(11)
Level 12: [Empty]
Level 14: [Empty]
Level 16: [Empty]
Level 18: [Empty]
Level 20: [Empty]
Level 22: [Empty]
Level 24: [Empty]
Level 26: [Empty]
Level 28: [Empty]
Level 30: [Empty]
Level 32: [Empty]
Level 35: [Empty]
Level 38: [Empty]
Level 41: [Empty]
Level 44: [Empty]
Level 47: [Empty]
Level 49: [Empty]
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Assassination


I think she might be able to hold off on placate due to the good control of the dom, but maybe not. We should be duoing mostly, with occasional solo play. Not concerned with PvP. No more than a couple hundred mil to spend on the build.

Is hasten recommended? My wife prefers fly as a travel power. Will she need stamina? Will she get auto crits when attacking a mob I have slept/dominated/confused?

I would appreciate any tactics or build advice you can offer.

Thanks.

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I'm the 'wifely stalker' of a similar duo - also currently in the pre-teens - so I can't offer any actual _experience_ yet... but it seems to me that Placate + AS + Hasten would be a very nice combination... I picked up Placate before our last logoff and can't wait to try it out on the double-lieutenant ToT spawns!

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I'm new-ish. Again.
@Kahzi. Pinnacle, mostly.