I'm new, now I'm trying to set up the game before I speedrun the game.

1. 30FPS (Frame Limiter ON)
2. Screen refresh rate (FL OFF, Vsync ON)
3. A choice between a maximum framerate, externally locked, or unlocked framerate.

Does this mean I can only ply on 30FPS not 60FPS, Frame Sync and Frame Limiter have to ON in the settings right? The second question is about the timer track, I have seen everyone is using LiveSplit tracking every mission time status, I'm using LiveSplit also but can I not track every mission time, just the detail timer running and stop after ending the game?

Frame limiter must be on if you want to speedrun and submit to this leaderboard. Livesplit or any external timer is not mandatory for speedrunning and you can have whatever splits you want.