have you tried invoking it with -T?

"¡½tasks (-T)
Display a list of the major tasks and their comments. Comments are defined using the ¡Èdesc¡É command."

From what i understand it's the closes you can get to what you are aiming for, but just by reading the documentation it seems there is no equivalent option, maybe you should just include the "verbose true" and "nowrite true" on you file as you metion.

(the -T will only display the tasks that have a defined comment).