These are my opinions, and are worth what you paid for them...Maybe less.
Scrub Radius: Negative scrub is for FWD. Some people talk about 0, but I'm more in the positive 5-15mm camp.
Bump steer: Zeroish, erring to the side of toe-in under compression.
Ride height/Ground clearance: I wouldn't bother with switching ride heights on a street/track toy. If it's just for fun, just run it at street ride height. I'd probably be a little over 100mm for that.
Wheels/Tyres: Totally reasonable. Although if going 15's, I'd try to keep it 17's capable for future proofing.
Roll Center: Roll center doesn't change how much total weight transfer occurs, but rather how it occurs. I'd keep the front RC low, just high enough to not cross the ground plane under full compression. Then generically set the rear a little higher, maybe 25-50mm. This also leads directly into looking at instant center lengths and camber gain.
Anti dive/Anti Squat: Better to err on the side of too little than too much.
Ackerman Steering: Your variable is the rack location. For front steer, set it to stay aft of the outer tie rods.
Suspension Travel: This is mostly the byproduct of how stiff you choose the suspension to be.
Steering Angle: As much as the rack travel will allow.
Track Width: Rear will be similar to Miata. These usually end up rear weight biased, so a bit narrower front wouldn't hurt.
_________________ -Justin
"Orville Wright did not have a pilots license." - Gordon MacKenzie
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