Alright, couldn't find any old posts.
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
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"];