I was unaware of an autosplitter as I generally have 4 splits set up on live split and just tap the start key to move onto the next split.

Generally I think for in game time we use MinecraftTimer (in resources) as you are doing 1.6.4 you will need the first one

I don't think it's possible to automatically detect enter never with live split, another program would have to find the right hooks for it.