You first need to define what you mean by "group calendaring." That expression can have more than one meaning in the context of Outlook.
If I understand correctly, you're asking for input into future enhancements for whatever you define as "group calendaring" in Outlook? I don't have the time to spare to indulge in that kind of speculation, but maybe once you describe your goal more fully someone else will.
Note that the main purpose of this forum is for people seeking assistance with Outlook calendar issues to post questions about their problems and receive answers.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers