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Yes that's it...scrub radius is the distance between the "tread center...and kingpin axis intersection with the ground." Couldn't remember myself either.
I wouldn't say I am a suspension engineer, but I did engineer a suspension on an off-road production vehicle a few years ago and had benefit of experience from an engineer and technician that designed a similar setup previously and a former tire engineer.
Bicycle Bob's right...it's more important to avoid toe out under braking as this is unstable. Driving down the road you should still be toe-in to compensate for compliance transition during braking. Toe-in during forward movement is comfortable for most as it assists the vehicle's steering finding center. There's less overall tire scrub as you approach 0 total toe so you want to shoot for the minimum level of static toe-in that prevents squirrelly handling under panic stops.
I was driving one of the off-road cars with the suspension I designed on it after a mechanic replaced a bunch of suspension parts must have neglected to set alignment. I thought I could see a visual toe-out (on 25" OD mud tires). I drove off to try it and it pulled to one side. I slammed on the brakes at an intersection on the test track and it shot to the other side of the road, putting me half off the road just short of the stop sign. Toe was out over 1/2".
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