I love the flexibility of tagging up our backlog as features for a wide variety of purposes. I limit this to a subset of the reasons I would do as I'm hesitant to maintain sets of records across hundreds of features. If however, I could set up e.g. integration rules with JIRA like 'if value A = X, add tag Y' I'd be able to maintain easily a wide range of queriable tags for different stakeholder groups.
Thank you for your idea. One workaround would be to use bulk edit to quickly add tags to a group of features.
At this time based on the ability to filter and bulk edit records, we are unlikely to implement a rules-based tagging option. We hope you can understand.