Notices to Roles in Groups

It would be really great to be able to send notices to specific roles within our groups. For example, land groups that allow people in for the purposes of placing prims might have different types of roles such as apartment renters and merchants. Merchants wouldn't be interested in notices for Apt renters and vice-versa. If we could chose to which role (or some/all roles if chosen that way) to which we wish to send a notice, this would be very helpful!