It Drove me wild!
I looked for a solution but found none.
therefor i took justice in my own hands
To disable autocorrection entirely, navigate to /system/Library/TextInput and delete every folder inside.
It's harsh, and there's probably a better way, but hey, i needed it done, and this is the way.
In theory it's possible to replace the autocorrection files, but till now i failed doing so.
(if i helped you, you know where the 'Tumbs Up' button is *grin*)