when you go on a Many streak, create a highlight reel of the matches before the streak is over.

That's just useless. You save a replay if you do something highlight worthy anyway.

not just for the player, this is something that can be fun for the whole lobby to enjoy. The engine is taxed enough as it is. This would honestly just be a TBN feature for that reason, and I'd just make it a feature for the whole lobby.

unnecessary tbh

and how would you designate specific parts to highlight