Yes, 1.001 Linux has much better input handling and also for Neutral and True Pacifist it has Mad Dummy Skip, which can't be done on any Windows version and saves over a minute and a half.
No, you don't. You'll be able to find a Linux on windows patch at https://www.speedrun.com/undertale/resources (posted by OceanBagel. Just scroll down patches and it should be there. This guide by Shayy is also really helpful https://www.speedrun.com/undertale/guide/exjem .
can you do sgs on windows?? lol I didn't know~ feel free to correct me if I got anything wrong~
sgs isnt a version specific skip like mad dummy skip, and it is only marginally affected by the unoptimal input handling of japenese versions. IE, doing stick sgs requires perfect execution with 0 frames to spare and cell phone sgs isnt actually too bad but is a frame more precise than windows/linux assuming you hit the first action key and release it a frame after.
@Bain8renn that is for JP, you can do inputs on consecutive frames on 1.0-1.001 windows but you have to release the first input before the start of the second frame
Nvm I’m stupid lol thought you were talking about windows still lol