I am looking into this as I am interested in this feature myself. However, it might take some time as I am quite busy at the moment. I will however report back as soon as the first usable version exists.

At the moment I am planning to support the following:

• Configuration via the Settings application of the N9/N950
• Calendar entries are shown in the feed pane of the home screen
• Default settings for all calendars: Maximum number of entries to show in advance, maximum number of days to show in advance
• Overridable settings for each calendar instance

Birthday support may come at a later stage. Do you have any further ideas of what should be included?