For threading purposes it'd be great if consecutive messages from the same person (maybe within some time window like 10 minutes) would be counted as a single message.

We use mattermost for an internal support chat and very often we get stuff like

"Hi!"
"I have this issue with the fronk, for customer Acme"
<screenshot>
"Could someone take a look?"

You can't reply to any of those messages without losing crucial information in the thread.