First question: normally I sincronize with Google Calendar but when the tasks don't appear in my Google Calendar when I change date's or put other new task on To do Ist.
Second question: Normally the email of the day arrive at 5am. Can i change the hour of my email?
Unfortunately with Google they only sync the iCal Feed once a day, which is why you will not see your changes right away. We hope we can change this in the future, but right now it's a limitation on Google's side.
Again, unfortunately, this cannot be changed. We recently made the email arrive earlier by request, and felt that earlier will not harm anyone, since it will still be in their Inbox.