Outbreak survival mode might be an interesting speedrun category.
That's all I've been playing lately and I wanted to look and if we had categories for it already since it's now a permanent game mode. At this point Outbreak Collapse is likely a permanent mode too but where Outbreak Collapse took almost half a year to finally return after its limited run, Outbreak Survival was brought back in roughly a week.
Personally, I think it's great for speedrunning. You have the same starting loadout as everyone else, your knowledge of the maps, and Outbreak in general, is much more impactful (especially for speedruns), and you have to make decisions on the fly with less information.
tl;dr: adding an Outbreak Survival category or set of categories would be awesome.