Would be a great feature if you would allow to have more than one license type, and more than one license billing type active on the tool. Some Admins and PMs would use a premium license which deliver more controls, better management features and analytics, while workforce could use a lower license tier/free guest access, once they only need to have access to projects they are assigned and track their time. On top of that, the ability to have yearly and monthly billing license would be fantastic, you can keep long term users and contractors on yearly licenses, while short term and seasonal freelancer you would use a monthly license. Having to license all user on the same plan and on the same license billing is quite a waste and so reduces the product value to the users.