There are a lot of PvP specific things that you could add for auto highlights, either basing off the medals that pop up on screen, or the bottom left feed as there are some unique text lines there for getting said medals.
Some of the following medals that are "sought after" would be;
- Seventh Colum
- We Ran Out of Medals
- Ghost in the Night
- Annihilation
- Undefeated
There are many more medals as well for the game modes like Iron Banner or Trials of Osiris as well, but these are a few of the gold medals from crucible that would be nice if they were auto captured.