Been doing a lot of work around Discourse lately and really love the software! Very well thought out, thank you!
One feature request: a link that automatically opens the reply composer, or asks the user to login and redirects them to the reply composer after a successful login. Basically exactly like How to create a new topic link with pre-filled information but for replies.
Having it in the theme component is better to avoid unnecessary redirects anyway, I’ll try improving it when I get a chance (I’ll comment here if I do).