I went ahead and attempted to build a version where I removed the replays with immovable objects with the change suggested above, and also removed the insufferable slowmo from replays. It's still a bit overzealous with the replays in crowded starts, but that'll smooth out as the field spreads.
I don't know why it's like less than a tenth of the size of the original DLL, but it seems to be working?
https://www.dropbox.com/s/wabb7swttdlx5yl/rF2autocam2.dll?dl=0
Quick sample of it in action. The stutters are my PC being suboptimal.
lowinc = 15, highinc = 40
EDIT:
So I couldn't help but notice, that the replay first jumps to the exact moment of the incident, and then five seconds before it, which causes quite a bit of CPU strain.
These two editions fix that, with and without wall collision, but the downside is that multiple replay-worth collisions happening close together don't get show properly - the next replay just picks up from where the previous left off. I also shortened the length of the replays to almost half. Would want to reduce it further but that seems to take some extra work.
https://www.dropbox.com/s/9nrlvbudzjexnze/rF2autocamFastWall.dll?dl=0
https://www.dropbox.com/s/af7ormnu4d2cyib/rF2autocamFastNoWall.dll?dl=0
Some Brands Hatch action with the very accident prone F1 1979 mod, low and high inc at 25 and 50, respectively. You can see the issue with the stacked incidents, but otherwise it seems to handle the situation quite well, even when half the field decides to have a picnic on track.