Skype and Slack provides deletion of message via the ellipses button and editing of message by pressing the arrow up on your keyboard (also available on ellipses button).
This is very convenient and I think it's not exclusive to Skype nor Slack.
Hi Jery - The best place to make suggestions to Atlassian is at https://jira.atlassian.com.
Most people on here are just users like you and me, so Atlassian may or may not see your suggestion.
This one sounds like the the feature you'd like, so I'd recommend commenting, watching or voting on it: https://jira.atlassian.com/browse/HCPUB-2209
Atlernatively, have a look at the all suggestions for HipChat at https://jira.atlassian.com/browse/HCPUB or make your own.
...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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