Hi,
I've passed this feedback on. In the latest build, you can add people to the appointment creation, although categories on task creation isn't there yet.
Also, I've passed on your feedback. Two pieces- concerning the default opening to tasks, if you place the 'Touchdown HD/Touchdown for Smartphones' widget, it will allow you to select a shortcut, meaning you can just go directly to that screen. As for accounts, those are supported, although POP3 and SMTP are not.