@Physikerwelt: Please try to avoid creating new tracking tasks if possible.
All subtasks of this task already have both VisualEditor and Math tags. You can also get the full list of open tasks with both tags. Would that be a sufficient saved search for you? You could also add that URL as a link to some project's workboard's side bar or such...
Basically wondering which underlying problem you're trying to solve by creating this task (which requires manual adding of subtasks). :)