I just posted a new beta (3.5.4) which fixes the problem with saving options.
Note that it's still not possible to set a relative reminder (like "5 minutes before") for task, and the Due Date for tasks is always based on the Default Duration. Therefore, if your Default Duration is 60 minutes, the Due Date for the task will be the beginning of the next hour. The reminder will be a number of minutes before that. I realize this isn't very useful or flexible. I'm having a hard time finding ANY information on how to programatically set a reminder relative to a due date. Any blackberry programmers out there, feel free to chip in some code or pointers.
Calendar entries are still rock solid, and if that's all you want, this is the release for you.
I'm considering what other features would make sense and would be easy. One thing I'm thinking about is passing in a list of Attendees (Invites) based on the From and CC lists in the email. Would this be interesting or useful? I would probably add yet another menu item for this (like "Onto Meeting" or something), because you're probably less likely to create a meeting than just an appointment.
I'm also considering a completely unrelated app to add menu items to the web browser to connect with del.icio.us (a la
https://addons.mozilla.org/en-US/firefox/addon/3615). Would anybody be interested in something like this?