Yes. You can do it by making a staticData.sqf file and calling it in your init.sqf. Spyderblack posted how to do this on Feb 5 in this thread: http://alivemod.com/forum/1676-some-c2istar-questions

I was trying to find the code on the wiki but I'm not seeing it. I thought it was there.

Quick copy and paste from an older post of mine

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Here's how you blacklist certain tasks.

staticData.sqf should be a file you create in the root of your mission folder

init.sqf

execVM "staticData.sqf";

staticData.sqf

if (!isServer) exitWith {};

waitUntil {!isNil "ALiVE_STATIC_DATA_LOADED"};

ALIVE_autoGeneratedTasks = ["MilAssault","MilDefence","CivAssault","Assassination","TransportInsertion","DestroyVehicles","DestroyInfantry","SabotageBuilding","InsurgencyPatrol","InsurgencyDestroyAssets"];

Remove an entry from the array to stop that task from being generated.

For example, removing MilAssault (first entry) would look like

ALIVE_autoGeneratedTasks = ["MilDefence","CivAssault","Assassination","TransportInsertion","DestroyVehicles","DestroyInfantry","SabotageBuilding","InsurgencyPatrol","InsurgencyDestroyAssets"];