I'm assigning tasks to teams so I don't have to make everyone owners of every task.  Projects is configured to allow timers for all project members, and the timer works fine in a browser.  The mobile app doesn't offer a timer for tasks assigned to a team.  It only shows up if I'm an owner.

Also, if a project is configured to charge a rate per task, the mobile app shows that rate as zp.invoice.rateperhour instead of something more user friendly.