As of now, modifying tags of others’ topic is restricted to Regulars (Trust Level 3 users).
From past discussions it looks like a fair share of the responsibility falls onto these 51 members. This is not enough imo. Curating tags is a community effort and I believe it needs to be accessible to more users with a wide range of interests.
I propose to lower the requirement for editing tags, or adjusting the requirements for Trust Level 3 so it includes a wider user base. (There are active scripters who posts scripts daily but are not considered Regular by the system)