Groups appointments are now OK, student and teacher side.
Fixes 1.8 / 1.9 incompatibility on groups_get_members(). This groups related API entry causes backportability issue to 1.8.
All branches fixed in CVS/Contrib.
I'm sorry not, I have no idea. I think this would be the result of an explicit and unanimous vote of the community for this to happen. I know that core teem is not willing integrating tons of new modules in the standard set because they would have to manage stability and take part in maintenance. Maybe if sufficiant voices are shouting for the opportunity may it increase this consideration.
Note that I will soon make more enhancements to this module : we need having it to shedule not only face-to-face meetings, but online meetings. The extension feature will add a way to define what for the scheduling is used, and be able to record an URL to a online meeting access point.
Cheers.