I am thugs/poison. I too love my dual wielding knockback machine. I have slotted my Punks for accuracy and knockback since they have the same attacks as a thugs mastermind (starting with the singleshot tier one, the first upgrade gives them dual wield and the second gives them empty clips)
You are not going for stamina?
Leadership is nice as it stacks with the leadership of your enforces. On the other side since you already have two leadership pets, maybe you dont need to choose that pool yourself as well.
Well other more knowledgable people will be able to give you better advise 
Haven't seen any guides on this combo. I've tried Mercs, Ninjas and latterly Necro (which I like, Necro/Poison is a great combo I think, and the only one I've taken to lvl 20). Then I bethought me to try out Thugs.
) But I've totally fallen in love with it. The great synergy so far is this: Force Bolt is a great power in FF, it's a very fast recharging, almost guaranteed (good acc) knockback. When combined with my own primary Dual Wield that I've taken, which has moderately reliable knockback, I've found that basically I can keep enemies off their feet enough to do some serious damage mitigation through knock back. The feel for this style of gameplay, as an MM, just feels totally right to me. (I should say another factor in this love is I've got a good bio that justifies the FF and thugs combo, so that also makes me happy with the char.)
For some reason the way I designed my character at creation, she looked amazingly cool with dual weapons, so I decided to take at least some of the solo MM powers this time round (had religiously avoided them on my previous MM forays).
I've played a fair bit with FF hero-side, and the reason I picked it was because I know that with FF there are only basically 4 or 5 "must have" powers in FF, the rest being situational enough so that you can pick more from other powersets, so I thought this would allow me to justify some MM primary attacks.
And I have to say - OMG this is the MM for me! (Well, at least up to lvl 4 so far
My plan is to take the two single target bubbles, of course, and Dispersion Field. Those are the definite FF powers that will be useful for my pets and teams. I'll fill in maybe one or two other FF powers if I can afford it, but from now on I'm going to concentrate on 1. Pets, 2. my own primary attacks, 3. Leadership pool and 4. Medicine pool.
So that's the rough plan. Any comments, tips or suggestions from anybody who's got one or both these pools as MM powers? Does this rough plan sound about right?
(Ooh, ooh, just remembered I can play around with Mids, w00t!!!)