Hmm thats easy, the traditional way obviously (discard=no good in fish -trust me I tried)
I dont think that the fish sort of disruption is neccesarely the way to go. The reason for this is that fish's disruption is concentrated around some heavy mana denial with cards like stifle, 5 strip effects and null rod. The land destruction strategy makes cards like Daze and Spiketail Hatchling very viable b/c they will act with out the downside of being highly situational. 
But the mana denial strategy is not what it used to be. Most decks run 3 to 5 basic lands making the the wastelands easy to dodge. Since one of the cornerstones in fish is the mana denial aspect, loosing some of the power of wastelands will not only affect the 4 wastelands but also cards like Daze and Spiketail so that they become less powerful. The loss of wasteland power could make the entire deck tilt.  
I think that this is a reason why the fish sort of disruption is not as viable as we make it. 
If im rigth, this leaves us with the same question as I stated above. What kind of disruption do we want to run?
Here is my take on some vital points:
Wasteland: The ideal of a aggro control deck must be slowing your opponent down just enough to take a small win. Wasteland in fish helped  a lot by contributing to the whole strategy of the the deck. I dont think that this strategy is viable anymore. Therefore I'm not a fan of running 4 wastelands unless dragon and cerebral assasin become huge. 
Permission: FoW is one of the best cards in vintage. Its level of power is very high. It doesnt cost anything to play except the pitch and life loss, so I think that this a natural inclussion for the deck. 
Voidmage this card is a counterspell that beats which is pretty cool. I've been playing a U/W weenie deck that used Aether Vial. If one uses Aether Vial Voidmage is really good. 
I dont know if Meddling Mage fits into this categori, but anyway i'm a big fan of this card in aggro control since, as E Face stated above, Meddling Mage is a 2/2 with huge disruption potential.
Discard: the only discard card I think worth of considering is Duress and since black doesnt offer much else for a aggro control  deck (tutors = tempo loss)discard is ruled out.
I dont know what to name the next category. Anyways this is the category where True Believer, Kami, Icatian Javelineer, Samurai of the Pale Curtian fit, Rootwater Thief fit in: 
I'm very fond of these cards, since they are creatures. This means that they can both beat and disrupt your opponents game plan. The Samurai is very good in vital matches such as slaver and dragon. Kami is good in the Oath match. True Believer is a house against combo and slaver. Rootwater Thief is good at keeping an opening lead. If it attacks 2 and your are able to use its ability it generally means game for a lot of decks.
The types of disruption I think that we should run is permission and then the last category that I dont know what to call. A base structure of the deck could be:
4 FoW
4 Meddling Mage
2-4 True Believer (depending on how much combo hate we want)
2-4 Samurai of the Pale Curtain (depending on how much slaver, dragon, crucible hate we want)
2-3 Voidmage (I simply havent done enough testing to put numbers on these. However the testing I have done show that 3 is probably the right number) 
2-4 Javelineers (depending on how much we hate welders)
As for draw in a deck like this I think that keeping the high number of damage threats the disruption part alone could produce, standstill is viable draw card (especially if Aether Vial and Manlands are included) . I'm not fond of brainstorm in a deck like this, since this deck wont be able to use a quality card filter to an advantage since the power level of many of the cards simply is too low to compete with Yawgmoths Will, Manadrain and all the other goodies that other decks run. Quantity is what ths deck needs.
Søren