Agreed. Just came looking to solve this problem. On a public P2, random visitors of the site are marking things resolved despite having no role in the project. I’ve just recently started using the plugin and wondered who the “someone” was that the plugin status timeline kept saying had marked my posts as resolved.
Members of the site should be the only ones able to resolve posts (whether they are contributors or administrators), so at least we could track down who has marked the post resolved.