I too have used Fastmail for over a year now, but I do wish they would add a few much needed features.
- I want better parsing of dates, so I can click on them, and add to my calendar.
- The calendar needs to be able to show more than one timezone at the same time.
- Have a way to create a secondary icon on your phone to go to the calendar. (You have to click multiple buttons)
- An iOS calendar widget would also be great.