HTML 5 2.6 Saving/Sharing Options using Windows Authentication

I'm testing the new Save/Share capabilities with our internal HTML5 2.6 viewer using Windows Authentication, and am wondering if anybody knows if there a way to keep "Individuals", but remove the "Groups" option under "Share With"?  Or, can we change where "Groups" points to?  If either of these are possible, where would this be done?

 

Thanks for any help/ideas.