Very good question Samer. I would dare to say it is because nobody has asked in the open yet. Thanks for bringing it up (we have talked about this a couple of times in Heidelberg behind closed doors).
Clearly a community toolkit should have a calendar that can be administered by the community (if the admin wants them to be able to).
On a side note... according to a professor I met recently this is a function that Blackboard used to have in an earlier version that professors really liked and has since been changed (maybe due to an architecture overhaul?).
