Summary of the scrolling problem:
Problem Flying claims to sprint with "scroll down". The problem is that you cannot hear him scroll. You can hear him scroll up and down in the stats menu, though. This suggests that he uses a macro to scroll. Someone said that for him, only scrolling up makes a sound, not scrolling down. Therefore, this video is insufficient, as it only shows him scrolling up (in order to scroll down the stats - which is the reverse of what you'd expect). https://www.youtube.com/watch?v=wnDxQJwuVo4 Omega fixed that, providing this link where he scrolls both ways: https://www.twitch.tv/videos/218197060?t=04h24m21s
Could it be free scrolling? Free scrolling is silent on my mouse unless I scroll way faster than the game can pick up on. However, as war as we know, his mouse lacks that feature: Overcooler says that Flying said that he uses a Blackadder Chroma. Omega says this model cannot free-scroll.