Yes you can. You can do that by building a HipChat Connect add-on. All detailed in https://developer.atlassian.com/hipchat/getting-started. For your add-on to access the entire group, you'll need to request the view_group and view_room scope (more on scopes here: https://developer.atlassian.com/hipchat/guide/hipchat-rest-api/api-scopes) and set the "allowGlobal" property on the descriptor to "true" (more here: https://www.hipchat.com/docs/apiv2/capabilities).
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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