I would have used ITR as a blank sheet to try some steps forward. These suggestions are ITR specific:

1. Leave ABS as almost every car classed came with it.
2. Every ITR car would get max 18" wheel.
3. Any shock with 2 external adjustments.
4. Use real HP and Torque numbers (yes they do exist) and publish them from multiple sources so all know what was used for classing and the math used==total transparency. If they are wrong someone will tell you and be asked to prove it.
5. Let all cars remove power steering and loop the rack (hp loss is not figured into formula)
6. What the devil is cruise control doing on a race car anyway?

Ducking now!!!