I don't have a Kingcat but do have my Bobcat set up with crow. I set up the max deflection as per the manual and then dialled in the crow, as bcovish said.

Assuming I have done mine correctly, you do end up with significantly reduced up aileron movement (1/4" sounds about right) and this is noticeable in flight. I find it ok for approach but I know of others than find the reduced movement a bit too much of a reduction in available roll for their liking.

Having said that, it is worth using the crow as it does really help the approaches.