For example in v1.4.1, you can trick first prize into turning faster by just going barely out of their pov, while in (maybe 1.4.3 also) 1.4.4, at least on Android, it can't do that, or it just became harder... I think this will impact runs in the future, or maybe I'm just not playing enough of 1.4.3 n .4

As long as the category doesn't specify which 1.4 version; you can choose which one to play with. Do what you think is best.

You can also move while being pushed by first prize in 1.3 so you can speedrun and hit a locker when you’re near an exit. This no longer works in 1.4 since first prize will push you straight into the hallway and you cannot move. In 1.4, you no longer got stuck in the desks and walls which is a good thing because it will massively slow you down and your stamina will run out with normal speed and principal of the thing will still give you detention.