i found it !
AI drivers of BWW had moving arms in cockpit because two lines in the BMW_Sauber_Upgrades.ini were wrong.
This is how it should look like:
UpgradeType="vue des bras du pilote"
{
Instance="WHEEL"
Incremental=0
UpgradeLevel="Ne pas voir les bras"
{
Description="Ne pas voir les bras"
Price=0
GEN=<PILOTOEXISTS>=""
GEN=<Piloto>=BRASbmw_no.GMT
}
UpgradeLevel="Voir les bras"
{
Description="Voir les bras"
Price=0
GEN=<PILOTOEXISTS>=""
GEN=<Piloto>=BRASbmw.gmt
oh yeah BTW sth = something
just trying to help...
