Russ N,
My comment was not necessarily directed to Iains setup, it was a general comment as to what can be achieved by mounting shocks/spring on a "linkage' system rather than direct to wishbone.
I am not in agreement with zero scrub radius, perhaps Kalun Likes finger tip steering, it is but one of the many things that go to steering load.
There is no "rule Book" that states X amount of scrub radius is excessive, it all depends on the package and what the designer wants to achieve.
Looking at a front suspension in isolation does not give you the total picture.
Ackerman
here is a series of plots
Vehicle configuration
Wheelbase 2159 Track 1346 KPI Static 9.5º castor 4º Toe in 1mm Max shock travel in bump 50mm in droop 30mm. Steering rack ahead of the front axle
The only change in the plots is the location of the tie rod at the steering arm
First plot #94
The ackerman is behind the rear axle by 70% of the wheel base
second plot #85 the tie rod location has moved outboard 9mm
The ackerman is behind the rear axle by 23.5% of the wheelbase.
Third plot # 80 the tie rod location has moved outboard a further 5mm
The ackerman 1.97% behind the rear axle Basically 100% ackerman.
Fourth plot #70 the tie rod location had moved outboard a further 10mm
The ackerman is 13.23% ahead of the rear axle approx 86% ackerman.
The tie rod location has moved a total of 24mm. Toe change ( out) on bump steer has increased dramatically (% wise) whilst the toe out in turn has gone from 0.58º to 3.10º @ 30º turn.
The golden rule " you should only change one thing at a time,but you cant"
Who would have thought that moving the tie rod location to change the ackerman characteristics would also have changed the bump steer. The changes to bump steer in the plots may well change a car from good to bad handling.