I have nested tasks that are much harder to parse when presented in the
unindented agenda view.

I would like to replace the CATEGORY column with a column that shows the
parent of the task.

So instead of

todo.txt    mow lawn
todo.txt    clean mower
todo.txt    buy fuel

i'd see

todo.txt      mow lawn
mow lawn   clean mower
mow lawn   buy fuel

Is this easy to do?