Does anyone make an aftermarket Auto-Steering system that can lock onto the guidance line when not moving?

The integrated/factory systems in our newer Cih/NH equipment will engage the auto-steer while not moving.

The EZ-Steer systems in our older tractors need to be moving to engage. 

To me, it is amazing how much nicer it can be to engage when not moving (or even when rolling in reverse in the combine) because when you start rolling is also when I need to be controlling several other functions.