While this workaround solution will give you the result you want (one notification for multiple edits), its nowhere near as handy as the self-generating email digest of changes you described would be. However..you can at least reduce the number of e-mails being sent through creative use of the options at the bottom of the Wiki edit screen.
For the first change you want to make without notifying players, check only the box labelled "Do not notify campaign members of this change." and select Save. For the remainder of the changes you make, have the same checkbox checked, but also check the checkbox for "Minor Change".
When you've finished all the edits, go and edit one more time, ensuring to check only the box labelled "Minor Change". Click Save, and without the other box checked this action will trigger an email notification for the change you just made, which (according to the revision information on this site) will be one edit containing all the changes you made over however long its been.
Posted on January 16, 2012 07:131326716033000