Trados live terminology should have an action log, so the admin can follow up on all changes in the term base.
E.g. who has imported, who has changed what terms.
The important think is to be able to see who and what they have done.
This could be a solution to the fact that you cannot have costume roles in the system at the moment, and can therefore not control who can change the terminology and who should just be able to see it.