I think it would be nice to pin/sticky comments to your projects so they remain at the top of the comments. Right now the only alternative is to write your own comment and then lock comments, but this comes with the downsides of only being able to sticky your own comment and not someone else's, as well as preventing other users from commenting altogether. I think it would be a good idea to add the ability to sticky comments on your projects so they stay at the top while letting others comment as well.