I'm not sure how to state this in the title the right way. Please, feel free to edit it if you can say it a better way.
Is there any way to quickly respond to a user (either a guy posting a comment, the OP or an answer poster), such as CTRL + clicking his name? I currently have to copy / paste his name and then add the @.
If there is not such feature, I think having it would be also an easier way to have a feature like this one, since the link to a user could have an HTML class (or something like that, I'm not that advanced on HTML but I think you get the idea) that identifies the link as link to a user. This class would be applied to links to user anywhere (including @username links in comments of course). This way, the system would easily distinguish when a user is being referenced (perhaps another attribute could be used to identify the referenced user).