At risk of inflaming any one, it’s not obvious to me how a caster change would result in toe-in or bump steer changes, especially when we are talking about caster changes of 3-5*.
I guess I’ll have to break out my “Engineer to Win”, and “Tune to Win” books, and the included suspension models!
I am familiar with the bump steer, as I have been setting up & swinging the suspension on my TVR. It can be pretty wicked at the limits of suspension travel.
I guess think a key design goal is minimizing it in the 80% of the range the suspension typically operates in.