Message text auto replacement setting (for things like JIRA ticket #s, profanity, or text templates)
A lot of people want to be able to type in a particular JIRA ticket number format into a message, and have the system convert it into a hyperlink directly to the tickets web page.
Instead of having this as a JIRA-specific feature, this could be implemented as a Team/Channel based phrase substitution/text replacement setting.
You could build this so that it'd accept whole words, or regex to make things really flexible. Here are a few examples (see screenshot).
It'd probably be best at a Team (rather than Channel) level, but I'd be happy with either.