I wrote a tool, SpeedPatrolling, that lets users do two things: mark an edit as patrolled, or rollback changes to the page. If I want to know how people are using the tool (without checking access logs or doing extra logging in the tool), I can easily see all the rollbacks in the recent changes by filtering for the OAuth CID: 1245 tag. However, while patrols made via the tool appear in the patrol log, they are not tagged with this tag and therefore I can’t distinguish which patrol log entries belong to my tool and which do not.
Some log types already support OAuth consumer tags: at least create, newuser, rights, and upload. But patrol is apparently not one of them.