Autolands in low vis conditions are only permitted in very light winds, usually around 10kts x-wind max, so the crosswind landing problem is not very severe.
The actual x-wind autoland limit in clear weather is 25kts and I carried out an autoland in such conditions years ago and the aircraft, a B767-300, performed flawlessly. Maintaining the runway centreline was not an issue.
The only way to provide manual input during an autoland is to disconnect the autopilot. If you attempt to 'help' the autopilot it'll probably disconnect by itself which then presents you with another problem.
Regards.