Let's make it easier to reply within comments!
In the chat, I became quite fond of the littte arrow to the right of every chat message to reply to that message:
It automatically adds the name of the person I want to reply to, which saves me the hassle of manually copying it or face the danger of misspelling someone's name. Can we have this for comments, please?
(In the chat, the arrow also makes my message refer to a specific message of the other user, but I don't dare asking for that.)
Alternatively, the tab-completion as in chat would be great, too.