I thought this was working at some point for all users, but now it only seems to be for admins.
Specifically, we use the FixVersions field to put in production release dates, which sometimes includes a team name (not always just a date).
As an admin I can do an in-line edit within create or while in a JIRA to add new values to that field, I want all users to be able to add their releases to that list without needing to give them admin rights.