There was this run on NG+ Santas Helper that had coop interaction where another player helped progress through the level (https://www.speedrun.com/rqter/run/z5j085jm), I had verified it at the time but after some consideration, I wanted the communities opinion (what little there is of it). Considering three options for this.
Option 1: Ban Coop interactions
Also just a small thing for milliseconds.
Option 1: Enforce milliseconds on all runs
Leave any other opinions in the replies : P