Opis mozliwości handler-ów
$recordModel->setHandlerExceptions(['disableHandlers' => true]);
$recordModel->setHandlerExceptions(['disableWorkflow' => true]);
$recordModel->setHandlerExceptions(['disableHandler' => ['ModTracker_ModTrackerHandler_Handler']]);
https://github.com/YetiForceCompany/YetiForceCRM/blob/developer/app/EventHandler.php#L23