Shared Access- groups

In our environment we have teams of people that closely work together.  They all need shared access to each others envelopes, but also need to quickly be able to handle envelopes for people not on the team. i  It would be great to be able to assign shared access to a group instead of having to enable it for each individual in the team.  This would also save lots of time when onboarding and offboarding people to the team as well.