It's hard to select which information displayed in query results is good for "everyone", so allow installs to add to it.
- in many-repositories setup, it's sometimes hard to figure out which repository a revision is in (This is the request I got locally).
- It might (And might not) make sense to show build results for CI in revision search item list.
- an install might want to put Points count on tickets, or a secondary state.
It might make sense to implement this in terms of Custom Fields, although that would mean adding configuration.
(This is similar to T4863, which talks about Worboard Cards).