We are currently working on an autosplitter. Right now it is very bare bones and supports autostart when you take control of the player, this is very close to the time that the IGT starts. It will also split at the end of flashbacks and end game.
IGT is not supported yet, we're having a difficult time tracking down a stable pointer to the IGT (thanks to the way GameMaker does things). If anyone has any experience developing autosplitters for GameMaker we would welcome any help :).
Auto Splitter source code: https://github.com/kapdap/conscript-autosplitter/
Auto Splitter is now avaliable in LiveSplit.
Although a stable pointer to the IGT remains elusive, I was able find a stable pointer to the value that pauses the timer itself.
LRT has been added to the Auto Splitter. The Auto Splitter will pause whenever the IGT pauses. Remember to set LiveSplit to compare against Game Time to enable LRT.