Redmine

It would be nice to be able to choose an existing list of current values while creating a new custom field of the type List.
For example, if I need a custom field for selecting one of the current projects, I would create a new custom field named Projects, then choose the Format = List, then I would either enter values one by one (as it is now implemented) or choose from a list of existing values (eg. Projects for the list of projects in my redmine, User for a list of registered users in my redmine, Roles for a list of the current roles in my redmine, etc.)