When a company changes name, moves to another location or change telephonenumber, it would be nice to have a solution in the address book, to change this information on multiple contacts. (The same function as More|Categorize..., but with more fields to edit.)
for fields with multiple values it would be handy to have this feature.
Same time "announcements" option is used to send a single message to multiple people. Enabling "Send attachments" via announcements as well as multi person chat will make it easy to share the same attachment with multiple people at one shot.