I was told that the reason the BMW stability/traction control system could not be used is that the software would need re-writing to work with such a light car. So significant cost.
I am not an IT expert but I don't think that re-writing the software would be a vast expense. The code would already exist, some parameters would need to be changed for sure, but in IT terms this is not a big job. There must be something more that we are perhaps missing, the control system perhaps? Even testing can't be that expensive once it is up and running?
Agreed that money is probably at the root of the issue,
Andy G 1999 +8 , Indigo Blue. Ex-John McKecknie/Mike Duncan 1955 +4 racer.