Invite groups, not just individuals

We have ~45 people in our organization. I want to invite most of these people to see most of the projects. It takes a long time to add 45 emails to a project. I know I can create a project template that has everyone already invited, but usually when I start a project I have just a few people invited. Later I want to roll the project out to everyone and it takes a long time to add all the members. It would be nice to set up email groups in quire - like engineering_group, marketing_group, etc. When you add that group, it adds all the members of that group.