When you create a task using the Outlook integration/add-on, it should pick up the system defaults at the very least.
If you are adding it to a PROJECT, by default it should pick up whatever that project has as the default task duration type settings & task constraints. Currently, all the tasks I add from Outlook come in with the Duration Type of "calculated" (our system default is simple) and if I put in a due date when I am assigning the task in Outlook, the Task Constraint is "Must Finish On".
This would be a huge time savings and would allow me to promote this add-in use with our users as I believe there is a use case for this.