The Roach actor uses an "Event Macro" called something like "Burrowed Zerg Unit - Mobile Animation Macro". This produces an attached Model type actor called "BurrowMoveEffect", which produces the dust clouds. Note that this actor doesn't inherit Cloak Status or Visibility by default, causing it to be visible even when the unit isn't.
To prevent enemies from seeing the trail, set the inherit flags to true. To remove it altogether set the model to Invisible, delete the events that create the model or remove the macro from the unit actor.
To toggle it manually (via abilities etc) create some kind of indicator for the ON status (dummy buff, actor message etc) and validate that on the actor. If you want to do this, elaborate on what exactly you're trying to do for more detailed help.
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The Roach actor uses an "Event Macro" called something like "Burrowed Zerg Unit - Mobile Animation Macro". This produces an attached Model type actor called "BurrowMoveEffect", which produces the dust clouds. Note that this actor doesn't inherit Cloak Status or Visibility by default, causing it to be visible even when the unit isn't.
To prevent enemies from seeing the trail, set the inherit flags to true. To remove it altogether set the model to Invisible, delete the events that create the model or remove the macro from the unit actor.
To toggle it manually (via abilities etc) create some kind of indicator for the ON status (dummy buff, actor message etc) and validate that on the actor. If you want to do this, elaborate on what exactly you're trying to do for more detailed help.