I'm using Customs Fields in each Space for each team. It would be nice to allow using the Created Groups in the Custom field type "User" in order to easily limit the choice.
In example : in my PMO Space i have got all project and customs fields for example : Technical Architect. And I don't want to find anyone else that someone from our Technical Architect group. because this role is mandatory in our project.
Using group allow me to keep the allowed values up to date just because all The technical Architect are a member of the group.
I hope other people will find interest in that Feedback 😃